Facebook might be the world’s biggest social network, rapidly on its way to reach the magical one billion user mark, but it is not the only one. Here are a few others that are highly competitive in their domestic markets:Vkontakte (In contact): Russia’s leading social network has more than 110 million registered users and 33 million daily unique visitors. According to comScore, the site had Europe’s highest overall user engagement in December 2011, with visitors spending an average of 7.9 hours ...

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