Social media are interactive computer-mediated technologies that facilitate the creation or sharing of information, ideas, career interests, and other forms of expression via virtual communities and networks.   The variety of stand-alone and built-in social media services currently available introduces challenges of definition; however, there are some common features: 
- Social media are interactive Web 2.0 Internet-based applications.  
- User-generated content such as text posts or comments, digital photos or videos, and data generated through all online interactions, is the lifeblood of social media.  
- Users create service-specific profiles for the website or app that are designed and maintained by the social media organization.  
- Social media facilitate the development of online social networks by connecting a user's profile with those of other individuals or groups.  
Users usually access social media services via web-based apps on desktops and laptops, or download services that offer social media functionality to their mobile devices (e.g., smartphones and tablets). As users engage with these electronic services, they create highly interactive platforms through which individuals, communities, and organizations can share, co-create, discuss, participate and modify user-generated content or self-curated content posted online.  Wikis are examples of collaborative content creation. Additionally, social media are used to document memories, learn about and explore things, advertise oneself and form friendships as well as the growth of ideas from the creation of blogs, podcasts, videos, and gaming sites.  This changing relationship between human and technology is the focus of the emerging fields of technoself studies.
Social media outlets differ from traditional media (e.g., magazines, newspapers, TV broadcasting, and radio broadcasting) in many ways, including quality,  reach, frequency, usability, immediacy, and permanence.  Additionally, social media outlets operate in a dialogic transmission system (many sources to many receivers) while traditional media outlets operate under a mono-logic transmission model (one source to many receivers). For example, a newspaper is delivered to many subscribers and a radio station broadcasts the same programs to an entire city. 
Some of the most popular social media websites, with over 100 million registered users, include Facebook (and its associated Facebook Messenger), TikTok, WeChat, Instagram, QZone, Weibo, Twitter, Tumblr, Baidu Tieba and LinkedIn. Other popular platforms that are sometimes referred to as social media services (differing on interpretation) include YouTube, QQ, Quora, Telegram, WhatsApp, LINE, Snapchat, Pinterest, Viber, Reddit, Discord, VK, Microsoft Teams, and more.
Observers have noted a wide range of positive and negative impacts of social media use. Social media can help to improve an individual's sense of connectedness with real or online communities and can be an effective communication (or marketing) tool for corporations, entrepreneurs, non-profit organizations, advocacy groups, political parties, and governments.
Social media may have roots in the 1840s introduction of the telegraph, which connected the United States.  The PLATO system launched in 1960, after being developed at the University of Illinois and subsequently commercially marketed by Control Data Corporation. It offered early forms of social media features with 1973-era innovations such as Notes, PLATO's message-forum application; TERM-talk, its instant-messaging feature; Talkomatic, perhaps the first online chat room; News Report, a crowd-sourced online newspaper, and blog; and Access Lists, enabling the owner of a note file or other application to limit access to a certain set of users, for example, only friends, classmates, or co-workers.
ARPANET, which first came online in 1967, had by the late 1970s developed a rich cultural exchange of non-government/business ideas and communication, as evidenced by the network etiquette (or "netiquette") described in a 1982 handbook on computing at MIT's Artificial Intelligence Laboratory.  ARPANET evolved into the Internet following the publication of the first Transmission Control Protocol (TCP) specification, RFC 675 (Specification of Internet Transmission Control Program), written by Vint Cerf, Yogen Dalal and Carl Sunshine in 1974.  This became the foundation of Usenet, conceived by Tom Truscott and Jim Ellis in 1979 at the University of North Carolina at Chapel Hill and Duke University, and established in 1980.
A precursor of the electronic bulletin board system (BBS), known as Community Memory, had already appeared by 1973. True electronic bulletin board systems arrived with the Computer Bulletin Board System in Chicago, which first came online on February 16, 1978. Before long, most major cities had more than one BBS running on TRS-80, Apple II, Atari, IBM PC, Commodore 64, Sinclair, and similar personal computers. The IBM PC was introduced in 1981, and subsequent models of both Mac computers and PCs were used throughout the 1980s. Multiple modems, followed by specialized telecommunication hardware, allowed many users to be online simultaneously. Compuserve, Prodigy and AOL were three of the largest BBS companies and were the first to migrate to the Internet in the 1990s. Between the mid-1980s and the mid-1990s, BBSes numbered in the tens of thousands in North America alone.  Message forums (a specific structure of social media) arose with the BBS phenomenon throughout the 1980s and early 1990s. When the World Wide Web (WWW, or "the web") was added to the Internet in the mid-1990s, message forums migrated to the web, becoming Internet forums, primarily due to cheaper per-person access as well as the ability to handle far more people simultaneously than telco modem banks.
Digital imaging and semiconductor image sensor technology facilitated the development and rise of social media.  Advances in metal-oxide-semiconductor (MOS) semiconductor device fabrication, reaching smaller micron and then sub-micron levels during the 1980s–1990s, led to the development of the NMOS (n-type MOS) active-pixel sensor (APS) at Olympus in 1985,   and then the complementary MOS (CMOS) active-pixel sensor ( CMOS sensor) at NASA's Jet Propulsion Laboratory (JPL) in 1993.   CMOS sensors enabled the mass proliferation of digital cameras and camera phones, which bolstered the rise of social media. 
An important feature of social media is digital media data compression,   due to the impractically high memory and bandwidth requirements of uncompressed media.  The most important compression algorithm is the discrete cosine transform (DCT),   a lossy compression technique that was first proposed by Nasir Ahmed in 1972.  DCT-based compression standards include the H.26x and MPEG video coding standards introduced from 1988 onwards,  and the JPEG image compression standard introduced in 1992.   JPEG was largely responsible for the proliferation of digital images and digital photos which lie at the heart of social media,  and the MPEG standards did the same for digital video content on social media.  The JPEG image format is used more than a billion times on social networks every day, as of 2014.  
The development of social media started off with simple platforms.  GeoCities was one of the earliest social networking services, launched in November 1994, followed by Classmates.com in December 1995 and SixDegrees.com in May 1997.  According to CBS news, SixDegrees is "widely considered to be the very first social networking site", as it included "profiles, friends lists and school affiliations" that could be used by registered users.  Unlike instant messaging clients, such as ICQ and AOL's AIM, or chat clients like IRC, iChat or Chat Television, sixdegrees.com was the first online business that was created for real people, using their real names.  Open Diary was launched in October 1998; LiveJournal in April 1999; Ryze in October 2001; Friendster in March 2003; the corporate and job-oriented site LinkedIn in May 2003; hi5 in June 2003; MySpace in August 2003; Orkut in January 2004; Facebook in February 2004; YouTube in February 2005; Yahoo! 360° in March 2005; Bebo in July 2005; the text-based service Twitter, in which posts, called "tweets", were limited to 140 characters, in July 2006; Tumblr in February 2007; Instagram in July 2010; and Google+ in July 2011.   
Research from 2015 shows that the audience spent 22% of their time on social networks,  thus suggesting the popularity of social media platforms. It is speculated that the increase in social media's popularity is due to the widespread daily use of smartphones. 
The variety of evolving stand-alone and built-in social media services makes it challenging to define them.  However, marketing and social media experts broadly agree that social media include the following 13 types of social media: 
- business networks,
- collaborative projects,
- Enterprise social networking,
- photo sharing,
- products/services review,
- social bookmarking,
- social gaming,
- social networks,
- video sharing, and
- virtual worlds. 
The idea that social media are defined simply by their ability to bring people together has been seen as too broad, as this would suggest that fundamentally different technologies like the telegraph and telephone are also social media.  The terminology is unclear, with some early researchers referring to social media as social networks or social networking services in the mid 2000s.  A more recent paper from 2015  reviewed the prominent literature in the area and identified four common features unique to then-current social media services:
- Social media are Web 2.0 Internet-based applications.  
- User-generated content (UGC) is the lifeblood of the social media organism.  
- Users create service-specific profiles for the site or app that are designed and maintained by the social media organization.  
- Social media facilitate the development of online social networks by connecting a user's profile with those of other individuals or groups.  
In 2019, Merriam-Webster defined "social media" as "forms of electronic communication (such as websites for social networking and microblogging) through which users create online communities to share information, ideas, personal messages, and other content (such as videos)" 
Mobile social media refer to the use of social media on mobile devices such as smartphones and tablet computers. Mobile social media are a useful application of mobile marketing because the creation, exchange, and circulation of user-generated content can assist companies with marketing research, communication, and relationship development.  Mobile social media differ from others because they incorporate the current location of the user (location-sensitivity) or the time delay between sending and receiving messages (time-sensitivity). According to Andreas Kaplan, mobile social media applications can be differentiated among four types: 
- Space-timers (location and time-sensitive): Exchange of messages with relevance mostly for one specific location at one specific point in time (e.g. Facebook Places WhatsApp; Foursquare)
- Space-locators (only location sensitive): Exchange of messages, with relevance for one specific location, which is tagged to a certain place and read later by others (e.g. Yelp; Qype, Tumblr, Fishbrain)
- Quick-timers (only time sensitive): Transfer of traditional social media mobile apps to increase immediacy (e.g. posting Twitter messages or Facebook status updates)
- Slow-timers (neither location nor time sensitive): Transfer of traditional social media applications to mobile devices (e.g. watching a YouTube video or reading/editing a Wikipedia article)
Some social media sites have the potential for content posted there to spread virally over social networks. The term is an analogy to the concept of viral infections, which can spread rapidly from person to person. In a social media context, content or websites that are "viral" (or which "go viral") are those with a greater likelihood that users will reshare content posted (by another user) to their social network, leading to further sharing. In some cases, posts containing popular content or fast-breaking news have been rapidly shared and reshared by a huge number of users. Many social media sites provide specific functionality to help users reshare content, such as Twitter's retweet button, Pinterest's pin function, Facebook's share option, or Tumblr's reblog function. Businesses have a particular interest in viral marketing tactics because a viral campaign can achieve widespread advertising coverage (particularly if the viral reposting itself makes the news) for a fraction of the cost of a traditional marketing campaign, which typically uses printed materials, like newspapers, magazines, mailings, and billboards, and television and radio commercials. Nonprofit organizations and activists may have similar interests in posting content on social media sites with the aim of it going viral. A popular component and feature of Twitter is retweeting. Twitter allows other people to keep up with important events, stay connected with their peers, and can contribute in various ways throughout social media.  When certain posts become popular, they start to get retweeted over and over again, becoming viral. Hashtags can be used in tweets, and can also be used to take count of how many people have used that hashtag.
"Cyborgs", a combination of a human and a bot,   are used to spread fake news or create a marketing "buzz".  Cyborgs can be bot-assisted humans or human-assisted bots.  An example is a human who registers an account for which they set automated programs to post, for instance, tweets, during their absence.  From time to time, the human participates to tweet and interact with friends. Cyborgs make it easier to spread fake news, as it blends automated activity with human input.  When the automated accounts are publicly identified, the human part of the cyborg is able to take over and could protest that the account has been used manually all along. Such accounts try to pose as real people; in particular, the number of their friends or followers should be resembling that of a real person.
There has been rapid growth in the number of U.S. patent applications that cover new technologies related to social media, and the number of them that are published has been growing rapidly over the past five years. There are now over 2000 published patent applications.  As many as 7000 applications may be currently on file including those that haven't been published yet. Only slightly over 100 of these applications have issued as patents, however, largely due to the multi-year backlog in examination of business method patents, patents which outline and claim new methods of doing business. 
According to Statista, in 2020, it is estimated that there are around 3.6 billion people using social media around the globe, up from 3.4 billion in 2019. The number is expected to increase to 4.41 billion in 2025. 
|#||Network Name||Number of Users
|Country of Origin|
|4||Facebook Messenger||1,300||United States|
According to a survey conducted by Pew Research in 2018, Facebook and YouTube dominated the social media landscape, as notable majorities of U.S. adults used each of these sites. At the same time, younger Americans (especially those ages 18 to 24) stood out for embracing a variety of platforms and using them frequently. Some 78% of 18-24-year-old youngsters used Snapchat, and a sizeable majority of these users (71%) visited the platform multiple times per day. Similarly, 71% of Americans in this age group used Instagram and close to half (45%) were Twitter users. However, Facebook remained the primary platform for most American adults. Roughly two-thirds of U.S. adults (68%) reported that they were Facebook users, and roughly three-quarters of those users accessed Facebook on a daily basis. With the exception of those 65 and older, a majority of Americans across a wide range of demographic groups used Facebook.  However, after Facebook's rapid growth in the United States over the years, the number of new U.S. Facebook accounts created has plateaued, with not much observable growth in the 2016-18 period. 
A study from 2009 suggests that there may be individual differences that help explain who uses social media and who does not: Extraversion and openness have a positive relationship with social media, while emotional stability has a negative sloping relationship with social media.  A different study from 2015 found that people with a higher social comparison orientation appear to use social media more heavily than people with low social comparison orientation. 
There is data to suggest from Common Sense Media that children under the age of 13 in the United States use social networking services. This is despite the fact that many social media sites have policies that state you must be at least 13-years-old or older to join.  In 2017, Common Sense Media conducted a nationally representative survey of parents of children from birth to age 8 and found that 4% of children at this age use social sites such as Instagram, Snapchat, or Musical.ly “often” or “sometimes.”  A different nationally representative survey by Common Sense in 2019 surveyed young Americans ages 8-16 and found that about 31% of children ages 8-12 ever use social media such as Snapchat, Instagram, or Facebook.  In that same survey, when American teens ages 16-18 were asked when they started using social media, 28% said they started to use it before they were 13-years-old. However, the median age of starting to use social media was 14-years-old.
In June 2020 during the COVID-19 pandemic, a nationally representative survey by Cartoon Network and the Cyberbullying Research Center surveyed Americans ages 9-12 found that the most popular social media site/app was YouTube (used by 67% of 9- to 12-year-old Americans in the past year). 
|Platform||Overall Percentage||Percentage of Boys||Percentage of Girls|
|Facebook Messenger Kids||15%||12%||18%|
|None of the above||5%||6%||5%|
Similarly, a nationally representative survey by Common Sense Media conducted in 2020 of Americans ages 13-18 found that YouTube was also the most popular social media site/app (used by 86% of 13- to 18-year-old Americans in the past year). 
|Platform||Percentage who used in 2017||Percentage who used in 2020|
|Another social networking service||3%||2%|
|Do not use social networking service||6%||4%|
Governments may use social media to (for example): 
- interact with citizens
- foster citizen participation
- further open government
- analyze/monitor public opinion and activities
- educate the public about risks and public health .
The high distribution of social media in the private environment drives companies to deal with the application possibilities of social media on
- customer-organizational level
- and on intra-organizational level. 
Marketplace actors can use social media tools for marketing research, communication, sales promotions/discounts, informal employee-learning/organizational development, relationship development/ loyalty programs,  and e-Commerce. Often social media can become a good source of information and/or explanation of industry trends for a business to embrace change. Trends in social-media technology and usage change rapidly, making it crucial for businesses to have a set of guidelines that can apply to many social media platforms. 
Companies are increasingly[ quantify] using social-media monitoring tools to monitor, track, and analyze online conversations on the Web about their brand or products or about related topics of interest. This can prove useful in public relations management and advertising-campaign tracking, allowing analysts to measure return on investment for their social media ad spending, competitor-auditing, and for public engagement. Tools range from free, basic applications to subscription-based, more in-depth tools.
Financial industries utilize the power of social media as a tool for analyzing the sentiment of financial markets. These range from the marketing of financial products, gaining insights into market sentiment, future market predictions, and as a tool to identify insider trading. 
Social media become effective through a process called[ by whom?] "building social authority".  One of the foundation concepts in social media has become[ when?] that one cannot completely control one's message through social media but rather one can simply begin to participate in the "conversation" expecting that one can achieve a significant influence in that conversation. 
Social media has a range of uses in political processes and activities. Social media have been championed as allowing anyone with an Internet connection to become a content creator  and empowering their users.  The role of social media in democratizing media participation, which proponents herald as ushering in a new era of participatory democracy, with all users able to contribute news and comments, may fall short of the ideals, given that many often follow like-minded individuals, as noted by Philip Pond and Jeff Lewis.  Online media audience members are largely passive consumers, while content creation is dominated by a small number of users who post comments and write new content. :78 Online engagement does not always translate into real world action, and it has been argued by Howard, Busch and Sheets that there is a digital divide in North America because of the continents history, culture, and geography. .
Younger generations are becoming more involved in politics due to the increase of political news posted on social media. Political campaigns are targeting Millennials online via social media posts in hope that they will increase their political engagement.  Social media was influential in the widespread attention given to the revolutionary outbreaks in the Middle East and North Africa during 2011.    During the Tunisian revolution in 2011, people used Facebook to organize meetings and protests.  However, there is debate about the extent to which social media facilitated this kind of political change. 
Social Media footprints of candidates have grown during the last decade and the 2016 United States Presidential election provides a good example. Dounoucos et al. noted that Twitter use by the candidates was unprecedented during that election cycle.  Most candidates in the United States have a Twitter account.  The public has also increased their reliance on social media sites for political information.  In the European Union, social media has amplified political messages. 
One challenge is that militant groups have begun to see social media as a major organizing and recruiting tool.  The Islamic State of Iraq and the Levant, also known as ISIL, ISIS, and Daesh, has used social media to promote its cause. In 2014, #AllEyesonISIS went viral on Arabic Twitter.  ISIS produces an online magazine named the Islamic State Report to recruit more fighters.  Social media platforms have been weaponized by state-sponsored cyber groups to attack governments in the United States, European Union, and Middle East. Although phishing attacks via email are the most commonly used tactic to breach government networks, phishing attacks on social media rose 500% in 2016. 
Increasing political influence on social media saw several campaigns running from one political side against another. Often, foreign campaigns were initiated to influence the political system of another country. An example would be the Twitter campaign run in Saudi Arabia, where thousands of tweets about Hillary Clinton’s trending on #HillaryEmails by supporters of Mohammed bin Salman. It also involved Riyadh's social marketing firm, SMAAT, which had a history of running such campaigns on Twitter.    Politicians themselves also use social media to their advantage and to spread their campaign messages and influence voters.
Some employers examine job applicants' social media profiles as part of the hiring assessment. This issue raises many ethical questions that some consider an employer's right and others consider discrimination. Many Western European countries have already implemented laws that restrict the regulation of social media in the workplace. States including Arkansas, California, Colorado, Illinois, Maryland, Michigan, Nevada, New Jersey, New Mexico, Utah, Washington, and Wisconsin have passed legislation that protects potential employees and current employees from employers that demand that they provide their usernames and/or passwords for any social media accounts.  Use of social media by young people has caused significant problems for some applicants who are active on social media when they try to enter the job market. A survey of 17,000 young people in six countries in 2013 found that 1 in 10 people aged 16 to 34 have been rejected for a job because of online comments they made on social media websites. 
It is not only an issue in the workplace but an issue in post-secondary school admissions as well. There have been situations where students have been forced to give up their social media passwords to school administrators.  There are inadequate laws to protect a student's social media privacy, and organizations such as the ACLU are pushing for more privacy protection, as it is an invasion. They urge students who are pressured to give up their account information to tell the administrators to contact a parent or lawyer before they take the matter any further. Although they are students, they still have the right to keep their password-protected information private. 
Before social media,  admissions officials in the United States used SAT and other standardized test scores, extra-curricular activities, letters of recommendation, and high school report cards to determine whether to accept or deny an applicant. In the 2010s, while colleges and universities still use these traditional methods to evaluate applicants, these institutions are increasingly accessing applicants' social media profiles to learn about their character and activities. According to Kaplan, Inc, a corporation that provides higher education preparation, in 2012 27% of admissions officers used Google to learn more about an applicant, with 26% checking Facebook.  Students whose social media pages include offensive jokes or photos, racist or homophobic comments, photos depicting the applicant engaging in illegal drug use or drunkenness, and so on, may be screened out from admission processes.
Social media has been used extensively in civil and criminal investigations.  It has also been used to assist in searches for missing persons.  Police departments often make use of official social media accounts to engage with the public, publicize police activity, and burnish law enforcement's image;   conversely, video footage of citizen-documented police brutality and other misconduct has sometimes been posted to social media. 
In the United States U.S. Immigration and Customs Enforcement identifies and track individuals via social media, and also has apprehended some people via social media based sting operations.  U.S. Customs and Border Protection (also known as CPB) and the United States Department of Homeland Security use social media data as influencing factors during the visa process, and continue to monitor individuals after they have entered the country.  CPB officers have also been documented performing searches of electronics and social media behavior at the border, searching both citizens and non-citizens without first obtaining a warrant. 
Social media comments and images are being used in a range of court cases including employment law, child custody/child support and insurance disability claims. After an Apple employee criticized his employer on Facebook, he was fired. When the former employee sued Apple for unfair dismissal, the court, after seeing the man's Facebook posts, found in favor of Apple, as the man's social media comments breached Apple's policies.  After a heterosexual couple broke up, the man posted "violent rap lyrics from a song that talked about fantasies of killing the rapper's ex-wife" and made threats against him. The court found him guilty and he was sentenced to jail.  In a disability claims case, a woman who fell at work claimed that she was permanently injured; the employer used the social media posts of her travels and activities to counter her claims. 
Courts do not always admit social media evidence, in part, because screenshots can be faked or tampered with.  Judges are taking emojis into account to assess statements made on social media; in one Michigan case where a person alleged that another person had defamed them in an online comment, the judge disagreed, noting that there was an emoji after the comment which indicated that it was a joke.  In a 2014 case in Ontario against a police officer regarding alleged assault of a protester during the G20 summit, the court rejected the Crown's application to use a digital photo of the protest that was anonymously posted online, because there was no metadata proving when the photo was taken and it could have been digitally altered. 
Social media marketing is the use of social media platforms and websites to promote a product or service and also to establish a connection with its customers. Although the terms e-marketing and digital marketing are still dominant in academia, social media marketing is becoming more popular for both practitioners and researchers. Social media marketing has increased due to the growing active user rates on social media sites. For example, Facebook currently has 2.2 billion users, Twitter has 330 million active users and Instagram has 800 million users.  One of the main uses is to interact with audiences to create awareness of their brand or service, with the main idea of creating a two-way communication system where the audience and/or customers can interact back; providing feedback as just one example.  Social media can be used to advertise; placing an advert on Facebook's Newsfeed, for example, can allow a vast number of people to see it or targeting specific audiences from their usage to encourage awareness of the product or brand. Users of social media are then able to like, share and comment on the advert, becoming message senders as they can keep passing the advert's message on to their friends and onwards.  The use of new media put consumers on the position of spreading opinions, sharing experience, and has shift power from organization to consumers for it allows transparency and different opinions to be heard.  media marketing has to keep up with all the different platforms. They also have to keep up with the ongoing trends that are set by big influencers and draw many people's attention. The type of audience a business is going for will determine the social media site they use. 
Social media personalities have been employed by marketers to promote products online. Research shows that digital endorsements seem to be successfully targeting social media users,  especially younger consumers who have grown up in the digital age.  In 2013, the United Kingdom Advertising Standards Authority (ASA) began to advise celebrities and sports stars to make it clear if they had been paid to tweet about a product or service by using the hashtag #spon or #ad within tweets containing endorsements. The practice of harnessing social media personalities to market or promote a product or service to their following is commonly referred to as Influencer Marketing. The Cambridge Dictionary defines an "influencer" as any person (personality, blogger, journalist, celebrity) who has the ability to affect the opinions, behaviors, or purchases of others through the use of social media. 
Companies such as fast food franchise Wendy's have used humor to advertise their products by poking fun at competitors such as McDonald's and Burger King.  Other companies such as Juul have used hashtags to promote themselves and their products. 
On social media, consumers are exposed to the purchasing practices of peers through messages from a peer's account, which may be peer-written. Such messages may be part of an interactive marketing strategy involving modeling, reinforcement, and social interaction mechanisms.  A 2011 study focusing on peer communication through social media described how communication between peers through social media can affect purchase intentions: a direct impact through conformity, and an indirect impact by stressing product engagement.  The study indicated that social media communication between peers about a product had a positive relationship with product engagement. 
Signals from social media are used to assess academic publications,  as well as for different scientific approaches.[ clarification needed] Another study found that most of the health science students acquiring academic materials from others through social media. 
In the United States, 81% of users look online for news of the weather, first and foremost, with the percentage seeking national news at 73%, 52% for sports news, and 41% for entertainment or celebrity news. According to CNN, in 2010 75% of people got their news forwarded through e-mail or social media posts, whereas 37% of people shared a news item via Facebook or Twitter.  Facebook and Twitter make news a more participatory experience than before as people share news articles and comment on other people's posts. Rainie and Wellman have argued that media making now has become a participation work,  which changes communication systems. However, 27% of respondents worry about the accuracy of a story on a blog.  From a 2019 poll, Pew Research Center found that Americans are wary about the ways that social media sites share news and certain content.  This wariness of accuracy is on the rise as social media sites are increasingly exploited by aggregated new sources which stitch together multiple feeds to develop plausible correlations. Hemsley and colleagues refer to this phenomenon as "pseudoknowledge" which develop false narratives and fake news that are supported through general analysis and ideology rather than facts.  Social media as a news source is further questioned as spikes in evidence surround major news events such as was captured in the United States 2016 presidential election. 
News media and television journalism have been a key feature in the shaping of American collective memory for much of the twentieth century.   Indeed, since the United States' colonial era, news media has influenced collective memory and discourse about national development and trauma. In many ways, mainstream journalists have maintained an authoritative voice as the storytellers of the American past. Their documentary style narratives, detailed exposes, and their positions in the present make them prime sources for public memory. Specifically, news media journalists have shaped collective memory on nearly every major national event – from the deaths of social and political figures to the progression of political hopefuls. Journalists provide elaborate descriptions of commemorative events in U.S. history and contemporary popular cultural sensations. Many Americans learn the significance of historical events and political issues through news media, as they are presented on popular news stations.  However, journalistic influence is growing less important, whereas social networking sites such as Facebook, YouTube and Twitter, provide a constant supply of alternative news sources for users.
As social networking becomes more popular among older and younger generations, sites such as Facebook and YouTube, gradually undermine the traditionally authoritative voices of news media. For example, American citizens contest media coverage of various social and political events as they see fit, inserting their voices into the narratives about America's past and present and shaping their own collective memories.   An example of this is the public explosion of the Trayvon Martin shooting in Sanford, Florida. News media coverage of the incident was minimal until social media users made the story recognizable through their constant discussion of the case. Approximately one month after the fatal shooting of Trayvon Martin, its online coverage by everyday Americans garnered national attention from mainstream media journalists, in turn exemplifying media activism. In some ways, the spread of this tragic event through alternative news sources parallels that of Emmett Till – whose murder by lynching in 1955 became a national story after it was circulated in African-American and Communist newspapers.
Social media are used to fulfill perceived social needs, but not all needs can be fulfilled by social media.  For example, a 2003 article found that lonely individuals are more likely to use the Internet for emotional support than those who are not lonely.  A nationally representative survey from Common Sense Media in 2018 found that 40% of American teens ages 13-17 thought that social media was “extremely” or “very” important for them to keep up with their friends on a day-to-basis.  The same survey found that 33% of teens said social media was extremely or very important to have meaningful conversations with close friends, and 23% of teens said social media was extremely or very important to document and share highlights from their lives.  Recently, a Gallup poll from May 2020 showed that 53% of adult social media users in the United States thought that social media was a very or moderately important way to keep in touch with those they cannot otherwise see in-person due to social distancing measures related to the COVID-19 pandemic. 
Sherry Turkle explores this topic in her book Alone Together as she discusses how people confuse social media usage with authentic communication.  She posits that people tend to act differently online and are less afraid to hurt each other's feelings. Additionally, Some online behaviors can cause stress and anxiety, due to the permanence of online posts, the fear of being hacked, or of universities and employers exploring social media pages. Turkle also speculates that people are beginning to prefer texting to face-to-face communication, which can contribute to feelings of loneliness.  Nationally representative surveys from 2019 have found this to be the case with teens in the United States  and Mexico.  Some researchers have also found that exchanges that involved direct communication and reciprocation of messages correlated with fewer feelings of loneliness.  However, that same study showed that passively using social media without sending or receiving messages does not make people feel less lonely unless they were lonely to begin with.
The term social media "stalking" or "creeping" have been popularized over the years, and this refers to looking at the person's "timeline, status updates, tweets, and online bios" to find information about them and their activities.  While social media creeping is common, it is considered to be poor form to admit to a new acquaintance or new date that you have looked through his or her social media posts, particularly older posts, as this will indicate that you were going through their old history.  A sub-category of creeping is creeping ex-partners' social media posts after a breakup to investigate if there is a new partner or new dating; this can lead to preoccupation with the ex, rumination, and negative feelings, all of which postpone recovery and increase feelings of loss. 
Catfishing has become more prevalent since the advent of social media. Relationships formed with catfish can lead to actions such as supporting them with money and catfish will typically make excuses as to why they cannot meet up or be viewed on camera. 
The more time people spend on Facebook, the less satisfied they feel about their life.  Self-presentation theory explains that people will consciously manage their self-image or identity related information in social contexts.  In fact, a critical aspect of social networking sites is the time invested in customizing a personal profile, and encourage a sort of social currency based on likes, followers, and comments.  Users also tend to segment their audiences based on the image they want to present, pseudonymity and use of multiple accounts across the same platform remain popular ways to negotiate platform expectations and segment audiences. 
However, users may feel pressure to gain their peers' acceptance of their self-presentation. For example, in a 2016 peer-reviewed article by Trudy Hui Hui Chua and Leanne Chang, the authors found that teenage girls manipulate their self-presentation on social media to achieve a sense of beauty that is projected by their peers.  These authors also discovered that teenage girls compare themselves to their peers on social media and present themselves in certain ways in an effort to earn regard and acceptance. However, when users do not feel like they reached this regard and acceptance, this can actually lead to problems with self-confidence and self-satisfaction.  A nationally representative survey of American teens ages 13-17 by Common Sense Media found that 45% said getting “likes” on posts is at least somewhat important, and 26% at least somewhat agreed that they feel bad about themselves is nobody comments on or “likes” their photos.  Some evidence suggests that perceived rejection may lead to feeling emotional pain,  and some may partake in online retaliation such as online bullying.  Conversely, according to research from UCLA, users' reward circuits in their brains are more active when their own photos are liked by more peers. 
Literature suggests that social media can breed a negative feedback loop of viewing and uploading photos, self-comparison, feelings of disappointment when perceived social success is not achieved, and disordered body perception.  In fact, one study shows that the microblogging platform, Pinterest is directly associated with disordered dieting behavior, indicating that for those who frequently look at exercise or dieting "pins" there is a greater chance that they will engage in extreme weight-loss and dieting behavior. 
Social media can also function as a supportive system for adolescents' health, because by using social media, adolescents are able to mobilize around health issues that they themselves deem relevant.  For example, in a clinical study among adolescent patients undergoing treatment for obesity, the participants' expressed that through social media, they could find personalized weight-loss content as well as social support among other adolescents with obesity  The same authors also found that as with other types of online information, the adolescents need to possess necessary skills to evaluate and identify reliable health information, competencies commonly known as health literacy. This has led to efforts by governments and public health organizations to use social media to interact with users, to limited success .
Other social media, such as pro-anorexia sites, have been found in studies to cause significant risk of harm by reinforcing negative health-related behaviors through social networking, especially in adolescents.   
Social media use sometimes involves negative interactions between users.  Angry or emotional conversations can lead to real-world interactions outside of the Internet, which can get users into dangerous situations. Some users have experienced threats of violence online and have feared these threats manifesting themselves offline. Related issues include cyberbullying, online harassment, and " trolling". According to cyberbullying statistics from the i-Safe Foundation, over half of adolescents and teens have been bullied online, and about the same number have engaged in cyberbullying.  Both the bully and the victim are negatively affected, and the intensity, duration, and frequency of bullying are the three aspects that increase the negative effects on both of them. 
One phenomenon that is commonly studied with social media is the issue of social comparison. People compare their own lives to the lives of their friends through their friends' posts.[ citation needed] Because people are motivated to portray themselves in a way that is appropriate to the situation and serves their best interests,  often the things posted online are the positive aspects of people's lives, making other people question why their own lives are not as exciting or fulfilling. One study in 2017 found that problematic social media use (i.e., feeling addicted to social media) was related to lower life satisfaction and self-esteem scores; the authors speculate that users may feel if their life is not exciting enough to put online it is not as good as their friends or family. 
Studies have shown that self-comparison on social media can have dire effects on physical and mental health because they give us the ability to seek approval and compare ourselves.  In one study, women reported that social media are the most influential sources of their body image satisfaction; while men reported them as the second most impacting factor. 
According to a study released in 2017 by researchers from the University of Pittsburgh, the link between sleep disturbance and the use of social media was clear. It concluded that blue light had a part to play—and how often they logged on, rather than time spent on social media sites, was a higher predictor of disturbed sleep, suggesting "an obsessive 'checking'".  The strong relationship of social media use and sleep disturbance has significant clinical ramifications for young adults health and well-being. In a recent study, we have learned that people in the highest quartile for social media use per week report the most sleep disturbance. The median number of minutes of social media use per day is 61 minutes. Lastly, we have learned that females are more inclined to experience high levels of sleep disturbance than males.  Many teenagers suffer from sleep deprivation as they spend long hours at night on their phones, and this, in turn, could affect grades as they will be tired and unfocused in school.  In a study from 2011, it was found that time spent on Facebook has a strong negative relationship with overall GPA, but it was unclear if this was related to sleep disturbances. 
One studied emotional effect is "Facebook depression", which is a type of depression that affects adolescents who spend too much of their free time engaging with social media sites.  This may lead to problems such as reclusiveness which can negatively damage one's health by creating feelings of loneliness and low self-esteem among young people.  A 2017 study of almost 6,000 adolescent students showed that those who self-reported addiction-like symptoms of social media use were more likely to report low self-esteem and high levels of depressive symptoms.  In a different study conducted in 2007, those who used the most multiple social media platforms (7 to 11) had more than three times the risk of depression and anxiety than people who used the fewest (0 to 2). 
A second emotional effect is social media burnout, which is defined by Bo Han as ambivalence, emotional exhaustion, and depersonalization.  Ambivalence refers to a user's confusion about the benefits she can get from using a social media site. Emotional exhaustion refers to the stress a user has when using a social media site. Depersonalization refers to the emotional detachment from a social media site a user experiences. The three burnout factors can all negatively influence the user's social media continuance. This study provides an instrument to measure the burnout a user can experience when his or her social media "friends" are generating an overwhelming amount of useless information (e.g., "what I had for dinner", "where I am now").
A third emotional effect is the " fear of missing out" (FOMO), which is defined as the "pervasive apprehension that others might be having rewarding experiences from which one is absent".  FOMO has been classified by some as a form of social anxiety.  It is associated with checking updates on friends' activities on social media.  Some speculate that checking updates on friends' activities on social media may be associated with negative influences on people's psychological health and well-being because it could contribute to negative mood and depressed feelings. 
The digital divide is a measure of disparity in the level of access to technology between households, socioeconomic levels or other demographic categories.   People who are homeless, living in poverty, elderly people and those living in rural or remote communities may have little or no access to computers and the Internet; in contrast, middle class and upper-class people in urban areas have very high rates of computer and Internet access. Other models argue that within a modern information society, some individuals produce Internet content while others only consume it,   which could be a result of disparities in the education system where only some teachers integrate technology into the classroom and teach critical thinking.  While social media has differences among age groups, a 2010 study in the United States found no racial divide.  Some zero-rating programs offer subsidized data access to certain websites on low-cost plans. Critics say that this is an anti-competitive program that undermines net neutrality and creates a " walled garden"  for platforms like Facebook Zero. A 2015 study found that 65% of Nigerians, 61% of Indonesians, and 58% of Indians agree with the statement that "Facebook is the Internet" compared with only 5% in the US. 
Eric Ehrmann contends that social media in the form of public diplomacy create a patina of inclusiveness that covers  traditional economic interests that are structured to ensure that wealth is pumped up to the top of the economic pyramid, perpetuating the digital divide and post-Marxian class conflict. He also voices concern over the trend that finds social utilities operating in a quasi- libertarian global environment of oligopoly that requires users in economically challenged nations to spend high percentages of annual income to pay for devices and services to participate in the social media lifestyle. Neil Postman also contends that social media will increase an information disparity between "winners" – who are able to use the social media actively – and "losers" – who are not familiar with modern technologies or who do not have access to them. People with high social media skills may have better access to information about job opportunities, potential new friends, and social activities in their area, which may enable them to improve their standard of living and their quality of life.
According to the Pew Research Center, a majority of Americans at least occasionally receive news from social media.  Because of algorithms on social media which filter and display news content which are likely to match their users’ political preferences, a potential impact of receiving news from social media includes an increase in political polarization due to selective exposure.  Political polarization refers to when an individual's stance on a topic is more likely to be strictly defined by their identification with a specific political party or ideology than on other factors. Selective exposure occurs when an individual favors information that supports their beliefs and avoids information that conflicts with their beliefs. A study by Hayat and Samuel-Azran conducted during the 2016 U.S. presidential election observed an " echo chamber" effect of selective exposure among 27,811 Twitter users following the content of cable news shows.  The Twitter users observed in the study were found to have little interaction with users and content whose beliefs were different from their own, possibly heightening polarization effects.  
Efforts to combat selective exposure in social media may also cause an increase in political polarization.  A study examining Twitter activity conducted by Bail et al. paid Democrat and Republican participants to follow Twitter handles whose content was different from their political beliefs (Republicans received liberal content and Democrats received conservative content) over a six-week period.  At the end of the study, both Democrat and Republican participants were found to have increased political polarization in favor of their own parties, though only Republican participants had an increase that was statistically significant. 
Though research has shown evidence that social media plays a role in increasing political polarization, it has also shown evidence that social media use leads to a persuasion of political beliefs.   An online survey consisting of 1,024 U.S. participants was conducted by Diehl, Weeks, and Gil de Zuñiga, which found that individuals who use social media were more likely to have their political beliefs persuaded than those who did not.  In particular, those using social media as a means to receive their news were the most likely to have their political beliefs changed.  Diehl et al. found that the persuasion reported by participants was influenced by the exposure to diverse viewpoints they experienced, both in the content they saw as well as the political discussions they participated in.  Similarly, a study by Hardy and colleagues conducted with 189 students from a Midwestern state university examined the persuasive effect of watching a political comedy video on Facebook.  Hardy et al. found that after watching a Facebook video of the comedian/political commentator John Oliver performing a segment on his show, participants were likely to be persuaded to change their viewpoint on the topic they watched (either payday lending or the Ferguson protests) to one that was closer to the opinion expressed by Oliver.  Furthermore, the persuasion experienced by the participants was found to be reduced if they viewed comments by Facebook users which contradicted the arguments made by Oliver. 
Research has also shown that social media use may not have an effect on polarization at all.  A U.S. national survey of 1,032 participants conducted by Lee et al. found that participants who used social media were more likely to be exposed to a diverse number of people and amount of opinion than those who did not, although using social media was not correlated with a change in political polarization for these participants. 
In a study examining the potential polarizing effects of social media on the political views of its users, Mihailidis and Viotty suggest that a new way of engaging with social media must occur to avoid polarization.  The authors note that media literacies (described as methods which give people skills to critique and create media) are important to using social media in a responsible and productive way, and state that these literacies must be changed further in order to have the most effectiveness.  In order to decrease polarization and encourage cooperation among social media users, Mihailidis and Viotty suggest that media literacies must focus on teaching individuals how to connect with other people in a caring way, embrace differences, and understand the ways in which social media has a real impact on the political, social, and cultural issues of the society they are a part of. 
Recent research has demonstrated that social media, and media in general, have the power to increase the scope of stereotypes not only in children but people of all ages.  Three researchers at Blanquerna University, Spain, examined how adolescents interact with social media and specifically Facebook. They suggest that interactions on the website encourage representing oneself in the traditional gender constructs, which helps maintain gender stereotypes.  The authors noted that girls generally show more emotion in their posts and more frequently change their profile pictures, which according to some psychologists can lead to self-objectification.  On the other hand, the researchers found that boys prefer to portray themselves as strong, independent, and powerful.  For example, men often post pictures of objects and not themselves, and rarely change their profile pictures; using the pages more for entertainment and pragmatic reasons. In contrast, girls generally post more images that include themselves, friends and things they have emotional ties to, which the researchers attributed that to the higher emotional intelligence of girls at a younger age. The authors sampled over 632 girls and boys from the ages of 12–16 from Spain in an effort to confirm their beliefs. The researchers concluded that masculinity is more commonly associated with positive psychological well-being, while femininity displays less psychological well-being.  Furthermore, the researchers discovered that people tend not to completely conform to either stereotype, and encompass desirable parts of both. Users of Facebook generally use their profiles to reflect that they are a "normal" person. Social media was found to uphold gender stereotypes both feminine and masculine. The researchers also noted that traditional stereotypes are often upheld by boys more so than girls. The authors described how neither stereotype was entirely positive, but most people viewed masculine values as more positive.
Social media has allowed for mass cultural exchange and intercultural communication. As different cultures have different value systems, cultural themes, grammar, and world views, they also communicate differently.  The emergence of social media platforms fused together different cultures and their communication methods, blending together various cultural thinking patterns and expression styles. [ better source needed]
Social media has affected the way youth communicate, by introducing new forms of language. Abbreviations have been introduced to cut down on the time it takes to respond online. The commonly known " LOL" has become globally recognized as the abbreviation for "laugh out loud" thanks to social media.
Another trend that influences the way youth communicates is (through) the use of hashtags. With the introduction of social media platforms such as Twitter, Facebook and Instagram, the hashtag was created to easily organize and search for information. Hashtags can be used when people want to advocate for a movement, store content or tweets from a movement for future use, and allow other social media users to contribute to a discussion about a certain movement by using existing hashtags. Using hashtags as a way to advocate for something online makes it easier and more accessible for more people to acknowledge it around the world.  As hashtags such as #tbt (" throwback Thursday") become a part of online communication, it influenced the way in which youth share and communicate in their daily lives. Because of these changes in linguistics and communication etiquette, researchers of media semiotics[ who?] have found that this has altered youth's communications habits and more.[ vague][ citation needed]
Social media has offered a new platform for peer pressure with both positive and negative communication. From Facebook comments to likes on Instagram, how the youth communicate, and what is socially acceptable is now heavily based on social media.  Social media does make kids and young adults more susceptible to peer pressure. The American Academy of Pediatrics has also shown that bullying, the making of non-inclusive friend groups, and sexual experimentation have increased situations related to cyberbullying, issues with privacy, and the act of sending sexual images or messages to someone's mobile device. On the other hand, social media also benefits the youth and how they communicate.  Adolescents can learn basic social and technical skills that are essential in society.  Through the use of social media, kids and young adults are able to strengthen relationships by keeping in touch with friends and family, make more friends, and participate in community engagement activities and services. 
Criticisms of social media range from criticisms of the ease of use of specific platforms and their capabilities, disparity of information available, issues with trustworthiness and reliability of information presented,  the impact of social media use on an individual's concentration,  ownership of media content, and the meaning of interactions created by social media. Although some social media platforms, such as servers in the decentralised Fediverse, offer users the opportunity to cross-post between independently run servers using a standard protocol such as ActivityPub, the dominant social network platforms have been criticized for poor interoperability between platforms, which leads to the creation of information silos, viz. isolated pockets of data contained in one social media platform.  However, it is also argued that social media has positive effects, such as allowing the democratization of the Internet  while also allowing individuals to advertise themselves and form friendships.  Others  have noted that the term "social" cannot account for technological features of a platform alone, hence the level of sociability should be determined by the actual performances of its users. There has been a dramatic decrease in face-to-face interactions as more and more social media platforms have been introduced with the threat of cyber-bullying and online sexual predators being more prevalent.  Social media may expose children to images of alcohol, tobacco, and sexual behaviors.[ relevant? ]  In regards to cyber-bullying, it has been proven that individuals who have no experience with cyber-bullying often have a better well-being than individuals who have been bullied online. 
Twitter is increasingly a target of heavy activity of marketers. Their actions focused on gaining massive numbers of followers, include use of advanced scripts and manipulation techniques that distort the prime idea of social media by abusing human trustfulness.  British-American entrepreneur and author Andrew Keen criticizes social media in his book The Cult of the Amateur, writing, "Out of this anarchy, it suddenly became clear that what was governing the infinite monkeys now inputting away on the Internet was the law of digital Darwinism, the survival of the loudest and most opinionated. Under these rules, the only way to intellectually prevail is by infinite filibustering."  This is also relative to the issue "justice" in the social network. For example, the phenomenon " Human flesh search engine" in Asia raised the discussion of "private-law" brought by social network platform. Comparative media professor José van Dijck contends in her book The Culture of Connectivity (2013) that to understand the full weight of social media, their technological dimensions should be connected to the social and the cultural. She critically describes six social media platforms. One of her findings is the way Facebook had been successful in framing the term 'sharing' in such a way that third party use of user data is neglected in favor of intra-user connectedness.
There has been speculation[ by whom?] that social media has become perceived as a trustworthy source of information by a large number of people.   The continuous interpersonal connectivity on social media, for example, may lead to people regarding peer recommendations as indicators of the reliability of information sources. This trust can be exploited by marketers, who can utilize consumer-created content about brands and products to influence public perceptions.  
Evgeny Morozov, a 2009–2010 Yahoo fellow at Georgetown University, contended that information uploaded to Twitter may have little relevance to the masses of people who do not use Twitter. In an article for the magazine Dissent titled "Iran: Downside to the 'Twitter Revolution'", Morozov wrote:
[B]y its very design Twitter only adds to the noise: it's simply impossible to pack much context into its 140 characters. All other biases are present as well: in a country like Iran it's mostly pro-Western, technology-friendly and iPod-carrying young people who are the natural and most frequent users of Twitter. They are a tiny and, most important, extremely untypical segment of the Iranian population (the number of Twitter users in Iran — a country of more than seventy million people — was estimated at less than twenty thousand before the protests). 
Professor Matthew Auer of Bates College casts doubt on the conventional wisdom that social media are open and participatory. He also speculates on the emergence of "anti-social media" used as "instruments of pure control". 
Social media "mining" is a type of data mining, a technique of analyzing data to detect patterns. Social media mining is a process of representing, analyzing, and extracting actionable patterns from data collected from people's activities on social media. Google mines data in many ways including using an algorithm in Gmail to analyze information in emails. This use of the information will then affect the type of advertisements shown to the user when they use Gmail. Facebook has partnered with many data mining companies such as Datalogix and BlueKai to use customer information for targeted advertising.  Massive amounts of data from social platforms allows scientists and machine learning researchers to extract insights and build product features. 
On April 10, 2018, in a hearing held in response to revelations of data harvesting by Cambridge Analytica, Mark Zuckerberg, the Facebook chief executive, faced questions from senators on a variety of issues, from privacy to the company's business model and the company's mishandling of data. This was Mr. Zuckerberg's first appearance before Congress, prompted by the revelation that Cambridge Analytica, a political consulting firm linked to the Trump campaign, harvested the data of an estimated 87 million Facebook users to psychologically profile voters during the 2016 election. Zuckerberg was pressed to account for how third-party partners could take data without users’ knowledge. Lawmakers grilled the 33-year-old executive on the proliferation of so-called fake news on Facebook, Russian interference during the 2016 presidential election and censorship of conservative media. 
For Malcolm Gladwell, the role of social media, such as Twitter and Facebook, in revolutions and protests is overstated.  On one hand, social media makes it easier for individuals, and in this case activists, to express themselves. On the other hand, it is harder for that expression to have an impact.  Gladwell distinguishes between social media activism and high-risk activism, which brings real changes. Activism and especially high-risk activism involves strong-tie relationships, hierarchies, coordination, motivation, exposing oneself to high risks, making sacrifices.  Gladwell discusses that social media are built around weak ties and he argues that "social networks are effective at increasing participation — by lessening the level of motivation that participation requires".  According to him "Facebook activism succeeds not by motivating people to make a real sacrifice, but by motivating them to do the things that people do when they are not motivated enough to make a real sacrifice". 
Disputing Gladwell's theory, in the study "Perceptions of Social Media for Politics: Testing the Slacktivism Hypothesis", Kwak and colleagues conducted a survey which found that people who are politically expressive on social media are also more likely to participate in offline political activity. 
Social media content is generated through social media interactions done by users through the site. There has always been a huge debate on the ownership of the content on social media platforms because it is generated by the users and hosted by the company. Added to this is the danger to the security of information, which can be leaked to third parties with economic interests in the platform, or parasites who comb the data for their own databases. 
Privacy rights advocates warn users on social media about the collection of their personal data. Some information is captured without the user's knowledge or consent through electronic tracking and third party applications. Data may also be collected for law enforcement and governmental purposes,  by social media intelligence using data mining techniques.  Data and information may also be collected for third party use. When information is shared on social media, that information is no longer private. There have been many cases in which young persons especially, share personal information, which can attract predators. It is very important to monitor what you share and to be aware of who you could potentially be sharing that information with. Teens especially share significantly more information on the internet now than they have in the past. Teens are much more likely to share their personal information, such as email address, phone number, and school names.  Studies suggest that teens are not aware of what they are posting and how much of that information can be accessed by third parties.
There are arguments that "privacy is dead" and that with social media growing more and more, some heavy social media users appear to have become quite unconcerned with privacy. Others argue, however, that people are still very concerned about their privacy, but are being ignored by the companies running these social networks, who can sometimes make a profit off of sharing someone's personal information. There is also a disconnect between social media user's words and their actions. Studies suggest that surveys show that people want to keep their lives private, but their actions on social media suggest otherwise. Everyone leaves a trail when they use social media. Every time someone creates a new social media account, they provide personal information that can include their name, birthdate, geographic location, and personal interests. In addition, companies collect data on user behaviors. All of this data is stored and leveraged by companies to better target advertising to their users. 
Another factor is ignorance of how accessible social media posts are. Some social media users who have been criticized for inappropriate comments stated that they did not realize that anyone outside their circle of friends would read their posts; in fact, on some social media sites, unless a user selects higher privacy settings, their content is shared with a wide audience.
According to a 2016 article diving into the topic of sharing privately and the effect social media has on expectations of privacy, "1.18 billion people will log into their Facebook accounts, 500 million tweets will be sent, and there will be 95 million photos and videos posted on Instagram" in a day. Much of the privacy concerns individuals face stem from their own posts on a form of a social network. Users have the choice to share voluntarily and have been ingrained into society as routine and normative. Social media are a snapshot of our lives; a community we have created on the behaviors of sharing, posting, liking, and communicating. Sharing has become a phenomenon which social media and networks have uprooted and introduced to the world.  The idea of privacy is redundant; once something is posted, its accessibility remains constant even if we select who is potentially able to view it. People desire privacy in some shape or form, yet also contribute to social media, which makes it difficult to maintain privacy.  Mills offers options for reform which include copyright and the application of the law of confidence; more radically, a change to the concept of privacy itself.
A 2014 Pew Research Center survey found that 91% of Americans "agree" or "strongly agree" that people have lost control over how personal information is collected and used by all kinds of entities. Some 80% of social media users said they were concerned about advertisers and businesses accessing the data they share on social media platforms, and 64% said the government should do more to regulate advertisers. 
According to the wall street journal published on February 17, 2019, According to UK law, Facebook did not protect certain aspects of the user data. 
The US government announced banning TikTok and WeChat from the States over national security concerns. 20 September 2020 was announced as the effective shutdown date for the instant messaging application, WeChat, while, access to TikTok was extended till 12 November 2020. 
The commercial development of social media has been criticized as the actions of consumers in these settings have become increasingly value-creating, for example when consumers contribute to the marketing and branding of specific products by posting positive reviews. As such, value-creating activities also increase the value of a specific product, which could, according to the marketing professors Bernad Cova and Daniele Dalli, lead to what they refer to as "double exploitation".  Companies are getting consumers to create content for the companies' websites for which the consumers are not paid.
As social media usage has become increasingly widespread, social media has to a large extent come to be subjected to commercialization by marketing companies and advertising agencies.  Christofer Laurell, a digital marketing researcher, suggested that the social media landscape currently consists of three types of places because of this development: consumer-dominated places, professionally dominated places and places undergoing commercialization.  As social media becomes commercialized, this process have been shown to create novel forms of value networks stretching between consumer and producer  in which a combination of personal, private and commercial contents are created. 
As one of the biggest preoccupations among adolescents is social media usage, researchers have begun using the term "F.A.D.", or "Facebook addiction disorder", a form of internet addiction disorder.  FAD is characterized by compulsive use of the social networking site Facebook, which generally results in physical or psychological complications. The disorder, although not classified in the latest Diagnostic and Statistical Manual of Mental Disorders (DSM-5) or by the World Health Organization, has been the subject of several studies focusing on the negative effects on the psyche. One German study, published in 2017, investigated a correlation between extensive use of the social networking site and narcissism; the results were published in the journal PLoS One. According to the findings: "FAD was significantly positively related to the personality trait narcissism and to negative mental health variables (depression, anxiety, and stress symptoms)."  While these issues regarding social media addiction are continuous and increasing, there are ways to help reduce and curb one's social media obsessions. Turning off notifications (temporary or long-term) is one solution that is deemed beneficial in attempts to lessen social media addiction by resolving issues of distraction, for those who struggle with the habit of constantly refreshing social media platforms and checking for new notifications. 
Having social media in the classroom was a controversial topic in the 2010s. Many parents and educators have been fearful of the repercussions of having social media in the classroom.  There are concerns that social media tools can be misused for cyberbullying or sharing inappropriate content. As result, cell phones have been banned from some classrooms, and some schools have blocked many popular social media websites. Many schools have realized that they need to loosen restrictions, teach digital citizenship skills, and even incorporate these tools into classrooms. Some schools permit students to use smartphones or tablet computers in class, as long as the students are using these devices for academic purposes, such as doing research. Using Facebook in class allows for the integration of multimodal content such as student-created photographs and video and URLs to other texts, in a platform that many students are already familiar with. Twitter can be used to enhance communication building and critical thinking and it provides students with an informal " back channel"), and extend discussion outside of class time.
Social media often features in political struggles to control public perception and online activity. In some countries, Internet police or secret police monitor or control citizens' use of social media. For example, in 2013 some social media was banned in Turkey after the Taksim Gezi Park protests. Both Twitter and YouTube were temporarily suspended in the country by a court's decision. A new law, passed by Turkish Parliament, has granted immunity to Telecommunications Directorate (TİB) personnel. The TİB was also given the authority to block access to specific websites without the need for a court order.  Yet TİB's 2014 blocking of Twitter was ruled by the constitutional court to violate free speech.  More recently, in the 2014 Thai coup d'état, the public was explicitly instructed not to 'share' or 'like' dissenting views on social media or face prison. In July of that same year, in response to WikiLeaks' release of a secret suppression order made by the Victorian Supreme Court, media lawyers were quoted in the Australian media to the effect that "anyone who tweets a link to the WikiLeaks report, posts it on Facebook, or shares it in any way online could also face charges".  On 27 July 2020, in Egypt, two women were sentenced to two years of imprisonment for posting TikTok videos, which the government claims are “violating family values”. 
Mastodon, GNU social, Diaspora, Friendica and other compatible software packages operate as a loose federation of mostly volunteer-operated servers, called the Fediverse, which connect with each other through the open source protocol ActivityPub. In early 2019, Mastodon successfully blocked the spread of violent right-wing extremism when the Twitter alternative Gab tried to associate with Mastodon, and their independent servers quickly contained its dissemination. 
In December 2019, Twitter CEO Jack Dorsey made a similar suggestion, stating that efforts would be taken to achieve an "open and decentralized standard for social media". Rather than "deplatforming", such standards would allow a more scalable, and customizable approach to content moderation and censorship, and involve a number of companies, in the way that e-mail servers work.[ citation needed]
Deplatforming is a form of Internet censorship in which controversial speakers or speech are suspended, banned, or otherwise shut down by social media platforms and other service providers that normally provide a venue for free expression.  These kinds of actions are similar to alternative dispute resolution. :4 As early as 2015, platforms such as Reddit began to enforce selective bans based, for example, on terms of service that prohibit " hate speech".  According to technology journalist Declan McCullagh, " Silicon Valley's efforts to pull the plug on dissenting opinions" have included, as of 2018 [update], Twitter, Facebook, and YouTube "devising excuses to suspend ideologically disfavored accounts". 
Law professor Glenn Reynolds dubbed 2018 the "Year of Deplatforming", in an August 2018 article in The Wall Street Journal.  According to Reynolds, in 2018 "the internet giants decided to slam the gates on a number of people and ideas they don't like. If you rely on someone else's platform to express unpopular ideas, especially ideas on the right, you're now at risk."  Reynolds cited Alex Jones, Gavin McInnes and Dennis Prager as prominent 2018 victims of deplatforming based on their political views, noting, "Extremists and controversialists on the left have been relatively safe from deplatforming." 
Most people see social media platforms as censoring objectionable political views. 
According to Danah Boyd’s, "White Flight in Networked Publics? How Race and Class Shaped American Teen Engagement with MySpace and Facebook", the media plays a large role in shaping people's perceptions of specific social networking services. When looking at the site MySpace, after adults started to realize how popular the site was becoming with teens, news media became heavily concerned with teen participation and the potential dangers they faced using the site. As a result, teens avoided joining the site because of the associated risks (e.g. child predators and lack of control), and parents began to publicly denounce the site. Ultimately, the site was labeled as dangerous, and many were detracted from interacting with the site. As Boyd also describes, when Facebook initially launched in 2004, it solely targeted college students and access was intentionally limited. Facebook started as a Harvard-only social networking service before expanding to all other Ivy League schools. It then made its way to other top universities and ultimately to a wider range of schools. Because of its origins, some saw Facebook as an "elite" social networking service. While it was very open and accepting to some, it seemed to outlaw and shun out most others who didn't fit that "elite" categorization. These narratives propagated by the media influenced the large movement of teenage users from one social networking service to another. 
- Arab Spring § Social media
- Augmented reality
- Citizen media
- Coke Zero Facial Profiler
- Connectivism (learning theory)
- Connectivity (media)
- Culture jamming
- Human impact of Internet use
- Internet politics
- List of photo sharing websites
- List of online video platforms
- List of social bookmarking websites
- List of social networking services
- Social media and psychology
- Metcalfe's law
- Networked learning
- New media
- Online presence management
- Online research community
- Participatory media
- Social media marketing
- Social media mining
- Social media optimization
- Social media surgery
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