Facebook's mobile ads now make up over half its revenue

Thanks to Facebook's 945 million monthly users, 53% of the social network's revenue comes from mobile advertising. Facebook earned $2.59 billion in revenue for Q4 2013, with 556 million daily active users on mobile for the month, and 945 million monthly active users on mobile.

The 556 million daily active users was just for December, which represents a 49% year-over-year increase, while the 945 million mobile monthly active users is up 39% year-over-year. This is so thanks to Facebook's News Feed ads, and its auto-play videos - as much as they annoy you, it's making the social network some serious green.