Just when you think Facebook can’t get any creepier, they push a new feature into one of their apps and prove you wrong. With the most recent update to their mobile app, Facebook can now passively listen in via your phone or tablet’s microphone while you compose a status update.
You may have suspected something was up if you pay attention to the permission notes that pop up when Google Play informs you that your apps need an update. The Facebook app now says it needs permission to access your microphone — along with pretty much everything else an Android app can be granted permission to access.

Don’t worry, though. Facebook says they’re respecting your privacy while they do this. While ambient audio is definitely being recorded, they’re not storing exactly what the microphone picks up. The new feature works just like Shazam does: it tries to match an audio fingerprint from your environment with one in its database. The goal is to figure out if you’re listening to particular song or watching a TV show like The Simpsons.

The other reason you shouldn’t panic is that this feature is totally optional for now. If you don’t want Facebook listening in while you type, you can simply tap no and presumably the app will follow your orders.. see more

source: geek