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Web 2.0 revolutionizes how people store and share personal data and contents today. Today, sharing of personal information and documents on the web is pervasive, from sites like flickr.com for photo sharing to myspace.com for profile sharing and blogger.com or twitter.com for opinion sharing . These sites form a part of what are referred to as social networking sites (SNs) and provide individuals with the ability to host and share a variety of personal content. These sites have an overwhelming impact on the way information is shared. Not only do these sites allow a user to share information with thousands of people, but they allow for this information to be spread very quickly in way of messages, posts and comments.