As the world's largest social networking site, it was no surprise that Facebook had the largest mobile audience, with more than 57 million mobile users in August. That's up 50% from the previous year, noted comScore.

's mobile audience jumped by a whopping 75% to reach 13.4 million. LinkedIn's mobile audience climbed 69% to hit 5.5 million.

There are no figures available for , which didn't until this summer.

Sharon Gaudin covers the Internet and Web 2.0, emerging technologies, and desktop and laptop chips for Computerworld. Follow Sharon on Twitter at or subscribe to . Her e-mail address is .

in Computerworld's Web 2.0 and Web Apps Topic Center.