Angry Birds Friends - essentially Angry Birds with Facebook integration - is now available on Android and iOS. The free mobile download is compatible with the established Facebook app, letting you invite Facebook friends to play, gift power-ups to your besties, take part in weekly challenges and resume progress between platforms.

The first weekly tournament will go live this Monday, May 6. After that, new weekly tournaments will be initiated every Monday, with new levels also being added every week. So until then, consider this practice time for the real thing - because friendship is all about proving you're better than the other person.