Social networking is one of the fastest-growing activities among mobile users around the world. And as one of the primary ways mobile users communicate with one another, it is proving a significant driver of Internet usage on mobile devices.

eMarketer predicts the number of mobile users accessing social networks from their mobile devices will reach 607.5 million worldwide by 2013, representing 43% of global mobile Internet users. In the US, mobile social networkers will total 56.2 million by 2013, accounting for 45% of the mobile Internet user population.

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