Edward Snowden says Facebook is spying on you

The U.S. government is not the only one that's watching you. 

So warns famed NSA whistleblower Edward Snowden, who on Thursday called Facebook to task for spying on its users. What's more, he promised to teach people how to fight back against such corporate surveillance. 

"In the weeks ahead, I aim to explain how each of these site [Facebook, Instagram, Youtube] spies on you, and methods to limit how much they know about you," he tweeted. "If you use them, keep an eye out."