Social media is computer-mediated technologies that facilitate the creation and sharing of information, ideas, career interests and other forms of expression via virtual communities and networks. 

 

… social media websites have more than 100,000,000 registered users.

In America, a survey reported that 84 percent of adolescents in America have a Facebook account.[7] Over 60% of 13 to 17-year-olds have at least one profile on social media, with many spending more than two hours a day on social networking sites.[8]

According to Nielsen, Internet users continue to spend more time on social media sites than on any other type of site. At the same time, the total time spent on social media sites in the U.S. across PCs as well as on mobile devices increased by 99 percent to 121 billion minutes in July 2012 compared to 66 billion minutes in July 2011.[9]

For content contributors, the benefits of participating in social media have gone beyond simply social sharing, to building a reputation and bringing in career opportunities and monetary income.

Per Wikipedia

https://en.wikipedia.org/wiki/Social_media