When Facebook submitted its S1 regulator filing before its IPO, it said that the company didn’t see mobile usage as a major source of revenue. As you can tell from the company’s acquisition of Instagram, as well as the roll out of a Facebook Camera app, mobile is now priority number one for the social network. And it should. According to the company’s statistics, it now has 600 million mobile users. That means more people access Facebook on their smartphones and tablets than on a laptop or desktop computer.

All of which makes sense. According to a report from Canalys, 487 million smartphones were sold worldwide in 2011, while only 414 million personal computers were sold. Speaking to Bloomberg Businessweek, Mark Zuckerberg acknowledged the shift, saying “as more phones become smartphones, it’s just this massive opportunity.” Uh, duh.