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A social networking service focuses on building and reflecting of social networks or social relations among people, e.g., who share interests and activities. A social network service essentially consists of a representation of each user his/her social links, and a variety of additional services.
Social book marking sites like Digg, Propeller, Technorati, Reddit, del and Stumbleupon are largely collections of users' bookmarks sometimes organised under terms relevant to that page. Given sufficient bookmarking of a particular page, peer users trust its usefulness as a destination worth exploring.
Both are best for getting traffic.
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