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Social media are computer-mediated tools that allow people to create, share, or exchange information, career interests, ideas, and pictures/videos in virtual communities and networks. ''Social media'' is defined as "a group of Internet-based applications that build on the ideological and technological foundations of Web 2.0, and that allow the creation and exchange of user-generated content." Furthermore, social media depends on mobile and web-based technologies to create highly interactive platforms through which individuals and communities share, co-create, discuss, and modify user-generated content. They introduce substantial and pervasive changes to communication between businesses, organizations, communities, and individuals. These changes are the focus of the emerging field of technoself studies. Social media differ from traditional or industrial media in many ways, including quality,〔 reach, frequency, usability, immediacy, and permanence. Social media operates in a dialogic transmission system (many sources to many receivers). This is in contrast to traditional media that operates under a monologic transmission model (one source to many receivers). ''"Social media has been broadly defined to refer to 'the many relatively inexpensive and widely accessible electronic tools that enable anyone to publish and access information, collaborate on a common effort, or build relationships."'' There are many effects that stem from Internet usage. According to Nielsen, Internet users continue to spend more time with social media sites than any other type of site. At the same time, the total time spent on social media in the U.S. across PC and 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 reputation and bringing in career opportunities and monetary income, as discussed in Tang, Gu, and Whinston (2012). == Classification of social media == Social media technologies take on many different forms including blogs, business networks, enterprise social networks, forums, microblogs, photo sharing, products/services review, social bookmarking, social gaming, social networks, video sharing, and virtual worlds.〔 The development of social media started off with simple platforms such as sixdegrees.com. Unlike instant messaging clients such as ICQ and AOL’s AIM, sixdegrees.com was the first online business that was created for real people, using their real names. However, the first social networks were short-lived because their users lost interest. The Social Network Revolution has led to the rise of the networking sites. Research shows that the audience spends 22 percent of their time on social networking sites, thus proving how popular social media platforms have become. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Social media」の詳細全文を読む スポンサード リンク
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