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With the proliferation of Web 2.0 and social networking sites, people can interact with each other easily through various social media. For instance, popular sites like Del.icio.us, Flickr, and YouTube allow users to comment sharing content (bookmark, photos, videos), and users can tag her own favorite content. Users can also connect to friends, and subscribe to or become a fan of other users. These diverse individual activities result in a multi-dimensional network among actors, forming cross-dimension group structures with group members focusing on similar topics. It is challenging to effectively integrate the network information of multiple dimensions to find out the cross-dimension group structure.
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