Facebook, a spy tool for the CIA?

The satirical news site The Onion has an obvious knack for inventing plots and scandals where there aren't any, but in the case of Facebook, it looks like I would have an easier time believing in a massive government surveillance operation. We already know that the popular social network transmits our personal information to all kinds of companies, so why not the CIA, the NSA, or worse yet, the CSRS (Canadian Intelligence and Security Service)?