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Facebook, LinkedIn, Twitter, Foursquare, My Space
AOL bought the social networking site Bebo for $850 million in 2008 but sold it for pennies two years later. Recently the former premier social networking site, MySpace, reduced their staff by 47% and restructured again amid mounting losses. These are good indicators that economic sustainability on the Internet, especially among social networking sites is not guaranteed. The recent massive $80 billion valuation of the social networking site Facebook should therefore be looked at with caution.