Connecting your game to Facebook helps us keep your account safe and rewards you with a gem bonus.
Please note that connecting your game to Facebook does not save your progress. The only way to save your game is by connecting it to Game Center or Google Play. However, connecting your game to Facebook is helpful verifying you are indeed the real owner of your account in cases of recovery or transferring your game to a new device.
Keep in mind, we do not have access to any personal information, including Facebook passwords.