According to research by Nielsen Mobile, over 4 million mobile phone users are accessing social networking sites via mobile internet.  MySpace, the leading social networking site among PC users, is also the most popular mobile internet social networking site in the U.S. with 2.8 million unique mobile users in December 2007.  In that same month, Facebook had about 1.8 million unique mobile users.  “Consumer demand for mobile social networking may be a significant driver of mobile service pricing models, as evidenced by Vodafone UK’s recent move to offer unlimited internet access as a standard feature of its new monthly mobile price plans,” says Jeff Herrmann, vice-president of Mobile Media at Nielsen Mobile.

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