Does the government like what you’re up to on Facebook?

Next time you take out your smart phone for a game of Angry Birds or to check Facebook, there’s a chance someone’s watching you. Documents leaked by Edward Snowden and reported on by The New York Times, the Guardian, and Pro Publica show that the NSA and Britain’s Government Communications Headquarters could be tracking data from some mobile apps. To hear the story from the BBC’s  security correspondent Gordon Corera, click the audio player above.