Mobile Ads Hit 30% of Facebook's Q1 Revenues - But At A Cost

's revenue growth, as ads on smartphones and tablets grew to 30% of revenues in the first quarter , up from 23% in the fourth quarter.

http://www.forbes.com/sites/roberthof/2013/05/01/mobile-ads-hit-30-of-facebooks-q1-revenues-but-at-a-cost/