Connecting your game to your Facebook account rewards you with 70 FREE DIAMONDS!
It also comes with many advantages!

1) Your progress will be saved! If you want to change your device, or if you have to reinstall the game, you only need to log into your Facebook account and your game state will be restored.
2) You can request lives from your friends AND also send them lives!
3) You can compare your friends' village ranks to yours!