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12 with that used in previous studies [38]. Online social networks serve a number of purposes, but three primary roles stand out as common across all sites. First, online social networks are used to maintain and strengthen existing social ties, or make new social connections. The sites allow users to “articulate and make visible their social networks”, thereby “communicating with people who are already a part of their extended social network” [38]. Second, online social networks are used by each member to upload her own content. Note that the content shared often varies from site to site, and sometimes is only the user’s profile itself. Third, online social networks are used to find new, interesting content by filtering, recommending, and organizing the content uploaded by users. 2.1.2 A brief history We now give a brief history of online social networks. The site Classmates.com [30] is regarded as the first web site that allowed users to connect to other users. It began in 1995 as a site for users to reconnect with previous classmates and currently it has over 40 million registered users. However, Classmates.com did not allow users to create links to other users; rather, it allowed users to link to each other only via schools they had attended. In 1997, the site SixDegrees.com [145] was created, which was the first social networking site that allowed users to create links directly to other users. As such, SixDegrees.com is the first site that meets the definition of an online social network from above.PDF Image | Online Social Networks: Measurement, Analysis, and Applications to Distributed Information Systems
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