. Nowadays, both at home and abroad, the development of social networks are very fast. In 2012 the total number of social networking users worldwide will reach 1.434 billion people, according to well-known data monitoring company pingdom published data show, social networking links and web plug-ins have occupied 25% of all websites worldwide. In the world's top ten thousand sites, this social network share is a staggering 49.3%. (Until July 2012).
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