q4 FB earnings

Facebook Inc. (Nasdaq: FB) beat top and bottom line estimates today (Thursday).

Full year 2014 FB earnings revealed a 58% increase in revenue year over year ($12.47 billion). Monthly active users (MAUs) - FB's lifeblood - grew to 1.39 billion for an increase of 13% in 2014. And mobile MAUs grew 26% in the same period.

The company overcame a disastrous 2012 IPO. Now, Facebook stock is up more than 38% in the last 12 months, and nearly 150% in the last two years.

There's one reason behind FB's big turnaround, and we've been saying it for two years. In 2013, Facebook mastered an element that is crucial to social media company profits...