From comScore:

The study found that 30.8 percent of smartphone users accessed social networking sites via their mobile browser in January 2010, up 8.3 points from 22.5 percent one year ago. Access to Facebook via mobile browser grew 112 percent in the past year, while Twitter experienced a 347-percent jump.

“Social networking remains one of the most popular and fastest-growing behaviors on both the PC-based Internet and the mobile Web,” said Mark Donovan, comScore senior vice president of mobile. “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.”

All channels, all devices, baby.

• 30% of smartphone users accessed social networks via mobile browsers – this was up from 22.5% in 2009.
• Total social networking access via mobile browsers on all mobile phones rose to 11.1% – this was up from 6.5% in 2009. Most of this growth was in the uptick in smartphone usage.

How does MySpace survive if their mobile-centric audience uses their mobile site less?