We've reached out to Facebook for clarification on its new policy, and also to Google to ask if it's aware a Play Store app is updating itself through alternate channels. Google's terms of service do not allow apps "that cause users to unknowingly download or install applications from sources outside of Google Play." The important question is whether Google feels Facebook is being clear enough that this is not a Play Store download. - http://www.theverge.com/2013/3/15/4107376/facebook-android-a...

It would amuse me if Google were to drop Facebook from the play store over this.