Facebook (FB -13.2%) plunges after meeting lowballed estimates, but reporting major slowdowns in...

Facebook (FB -13.2%) plunges after meeting lowballed estimates, but reporting major slowdowns in Payments growth, Western user growth, and U.S. ad impressions, as well as huge spending hikes. The ad impression drop is fueling concerns the shift to mobile is doing more damage than thought. Analysts are mostly staying positive: Needham expects mobile monetization to improve as advertisers get more comfortable with the platform. ZNGA -2.7%. LNKD -4.7%. RENN -3.1%. (transcript)