Facebook is on a roll. Recently released Q4 2014 earnings show full-year revenues of $12.47 billion, a 58% year-over-year increase. Most of this growth is driven by ad revenues, which reached an all-time high of $3.59 billion for Q4 alone, and specifically mobile ad revenues, which represented 69% of total Q4 ad revenues. This is a far cry from the spring of 2012, when the world’s biggest social network openly acknowledged it had a mobile ad monetization problem. Shortly thereafter, Zuck and crew did an about face and went all in on mobile. And they’ve been cashing in ever since.