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At the beginning of Web 2.0 era, Online Social Networks (OSNs) appeared as just another phenomenon among wikis, blogs, video sharing, and so on. However, they soon became one of the biggest revolution of the Internet era. Statistics confirm the continuing rise in the importance of social networking sites in terms of number of users (e.g., Facebook reaches 750 millions users, Twitter 200 millions, LinkedIn 100 millions), time spent in social networking sites, and amount of data flowing (e.g., Facebook users interact with about 900 million piece of data in terms of pages, groups, events and community pages). This successful trend lets OSNs to be one of the most promising paradigms for information sharing on the Web.