You can now download Angry Birds Friends free for Android and iOS, which allows you to link up with your Facebook friends for weekly tournaments of bird flinging action. It requires an internet connection and Facebook account to play.
The Facebook version has got 15 million active players, so developer Rovio has decided to give them mobile access to the game. The basics of the game are the same - launch the Angry Birds at the pigs who have stolen their eggs. The difference in Angry Birds Friends is that you're competing with friends to win the bronze, silver or gold trophies.
Sharing scores and competing with friends is the main attraction here, as the game doesn't offer anything else new to the formula.