It found the social networking behemoth not only had the largest audience of the top 75 social media sites – at 22.8m unique users in September 2009 – but accounted for three-quarters of time on social media sites, up from 63% in 2008.

Facebook’s gain in share of time spent on social sites has been at the expense of others such as YouTube, whose share fell from 12.7% in September 2008 to just 8.4%.

Compare market share Q2 2009 with Q3 2009

              Q2        Q3

Nokia      51%      44%

RIM        14%      19%

Apple      14%      17%

HTC        12%        9%

Samsung   6%        5%