On smartphones, at least.
30.8% of smartphone users accessed social networking mobile sites in January 2010, according to research from comScore. That's up from 22.5% a year ago.
Facebook and Twitter's mobile sites were the chief beneficiaries, with traffic rising 112% and 347% respectively in the last year.
"Social media is a natural sweet spot for mobile since mobile devices are at the center of how people communicate with their circle of friends, whether by phone, text, email, or, increasingly, accessing social networking sites via a mobile browser," says comScore's Mark Donovan.
What about all mobile users though - not just smartphone users? comScore says that 11.1% of all users accessed a social networking site via their mobile browser in January - up from 4.6% a year ago. But much of that increase is being driven by smartphones.
Breaking the numbers down to sites, comScore says 25.1 million people accessed Facebook from a mobile browser in January, while MySpace attracted 11.4 million, and Twitter 4.7 million. MySpace's numbers were actually down 7% year-on-year.
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There's a great big elephant in the room though, and that's the lack of any figures on how many people are accessing these sites not through their browsers, but through downloadable apps.
In February this year, Facebook said that 100 million people are "actively using Facebook from their mobile devices every month". Although that was a global figure, and comScore's mobile web stats are US-only - so it's not apples and apples.
