If you have Facebook friends who play C.A.T.S. and they have connected their Facebook accounts to the game as well, but you cannot see them, please do the following:

1. Open Facebook application and navigate to Settings & Privacy > Settings > Apps & Websites >  C.A.T.S. > Remove App > Remove

2. Reinstall the game itself (do not forget to check that Cloud synchronization is turned ON in-game Options, otherwise you will lose your progress).

3. Launch C.A.T.S. and pass the tutorial.

4. Go to Options and log into Facebook.

5. Open Facebook app and go to Settings & Privacy > Settings > Apps & Websites >  C.A.T.S.  and check that "Friend list" is enabled.

6. Enjoy the game!

If it doesn't help, maybe your friends unfriended you on Facebook or disconnected their accounts from the game. That's always sad, so we hope it's not the case.