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The past decade has seen a massive rise in Web services and applications that let users create, collaborate, and share various forms of data including articles (blogs), pictures (Flickr), video (YouTube), and status updates (Twitter). Social bookmarking Web sites such as Delicious.com, Slashdot.org, and Digg.com let users submit links to Web content they find interesting along with a short description. Users in these online communities can comment on the posted content (initiating discussions) and rate the articles they find interesting. Thus, social bookmarking sites serve as data aggregators, Web-based discussion forums, and an online collaborative filtering system that can collectively determine popular online content.