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.
Below, other findings from the comScore 2010 Mobile Year in Review report.
Facebook is a huge driver of mobile social networking: The number of US users accessing the social networking site via mobile reached roughly 44 million as of December, up 121% over the previous year.
YouTube and Twitter held the second and third position in the US, growing 74% and 71%, respectively, whereas the number of users accessing MySpace via mobile fell 20% in the US.