The growth and popularity of online social networking sites are undeniable, In the past few years, sites such as Facebook, MySpace, Ning, Linkedln, Friendster, Flickr, Twitter, Second Life, and numerous others have burst onto the scene, capturing users' attentions and imaginations. Once the online destination of teenagers and college students, they have quickly become mainstream, shifting the demographic composition and the conversation, At their core, social networking sites allow users to increase and maintain personal interactions; people can find and interact with one another, share interests, make connections, and create content across multiple media forms.
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