Rise in Mobile Ads Pushes Up Revenue and Profit at Facebook - NYTimes.com

Upwardly mobile Facebook

"Facebook now makes the majority of its money from mobile advertising, a dramatic shift for a company that got virtually no money from mobile in 2012.
The social networking giant reported on Wednesday that 53 percent of its advertising revenue in the fourth quarter came from mobile devices. And at the end of the year, three-quarters of its 1.23 billion global users were accessing the service on a cellphone or tablet."

Rise in Mobile Ads Pushes Up Revenue and Profit at Facebook - NYTimes.com