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The recent surge in popular social communities like Flickr.com, YouTube.com, and Digg.com has sparked renewed interest in the Internet as a medium, credited largely to Web 2.0 technologies and social computing concepts. These innovations, such as Ajax, XML, blogs, tagging, and voting, facilitate easy and diverse interactions among users, blending individual relationships and message-based conversations with collective interactions like voting and ranking, thereby enriching user communication.