DigitalFacebook’s Q4 2014: Mobile is Now 69% Of Ad RevenueAll estimates going into Q4 showed that ad spend on Facebook would rise. Facebook validated this belief Wednesday, showing that the company reaped its all-time high in quarterly ad revenue — $3.59 billion.By Justin Lafferty|January 28, 2015ShareBy Justin Lafferty|January 28, 2015SharePages: 1 2 Adweek Adweek