My game app deleted .. now I do not know what to do?

To continue you will need to reinstall the app and start a new game. You will have to play through the opening section until you reach a point where you can access the settings menu. Then go to the Account section and use the Switch Account option to then log back into your old game.

I have not tried recovering games with facebook but it should work when you log in. If you have any trouble you can use the 'Retrieve Lost account option to contact the game developers to assist you.