If you are having trouble linking the game with your Facebook account, please try the following. 1. Log out, go to the in-game setting menu, tap "Facebook" and log in with a Facebook account. 2. Check if the game is among the allowed apps under the message "Allow these apps to use your account". .3. Restart the game and try linking your Facebook account again. If the issue continues, please try downloding the Facebook app on the Apple App Store or Google Play.