A Facebook page on a mobile phone.
Social media are
computer-mediated technologies that facilitate the creation and sharing of
information, ideas, career interests and other forms of expression via
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
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
- Social media facilitate the development of online
social networks by connecting a user's profile with those of other individuals or groups.
Users typically access social media services via
web-based technologies on
top, computers, and
laptops, or download services that offer social media functionality to their mobile devices (e.g.,
tablet computers). When engaging with these services, users can create highly interactive platforms through which individuals, communities and organizations can share, co-create, discuss, and modify user-generated content or pre-made content posted online. They introduce substantial and pervasive changes to communication between businesses, organizations, communities and individuals.
 Social media changes the way individuals and large organizations communicate. These changes are the focus of the emerging fields of
technoself studies. Social media differ from paper-based media (e.g., magazines and newspapers) or traditional electronic media such as
TV broadcasting in many ways, including quality,
reach, frequency, interactivity, usability, immediacy, and permanence. Social media outlets operate in a dialogic transmission system (many sources to many receivers).
 This is in contrast to
traditional media which operates under a monologic transmission model (one source to many receivers), such as a paper newspaper which is delivered to many subscribers, or a radio station which broadcasts the same programs to an entire city. Some of the most popular social media websites are
Facebook (and its associated
YouTube. These 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.
 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.
 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.
 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.
Observers have noted a range of positive and negative impacts of social media use. Social media can help to improve individuals' sense of connectedness with real or online communities, and social media can be an effective communication (or marketing) tool for corporations, entrepreneurs, nonprofit organizations, including advocacy groups and political parties and governments. At the same time, concerns have been raised about possible links between heavy social media use and
depression, and even the issues of
harassment and "
trolling". Currently, about half of young adults have been cyberbullied and of those, 20 percent said that they have been cyberbullied regularly.
 Another survey was carried out among 7th grade students in America, which is known as the Precaution Process Adoption Model. According to this study, 69 percent of 7th grade students claim to have experienced cyberbullying and they also said that it is worse than face to face bullying.
 However both the bully and the victim are negatively affected, the intensity, duration and frequency are the three aspects that increase the negative effects on both of them