Driven primarily by Facebook, social networking is the fastest-growing mobile content category in the US: Nearly 58 million mobile subscribers accessed a social networking site at least monthly via mobile device as of December 2010, up 56% from the previous year, according to a report by comScore.

Classifieds was the second-strongest mobile content growth category, reaching nearly 17 million mobile subscribers as of December, up 55% over the previous year, followed by online retail sites (up 53%).

Among smartphone users, social networking use was even more pronounced: 57.3% of US smartphone users (36.2 million users) accessed social networking sites or blogs at least once during the month as of December, up 11.2 percentage points over the previous year.

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