If you have Facebook friends who play KoT 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 Help & Settings > Privacy Shortcuts > More Settings > Apps > Logged in with Facebook > Kings of Thieves > Remove App > Remove.
Alternatively, find and remove King of Thieves from here.

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

3. Launch KoT and pass the tutorial.

4. Go to Options and log into Facebook.

5. Open the Facebook app and go to Help & Settings > Privacy Shortcuts > More Settings > Apps > Logged in with Facebook > Kings of Thieves and check that "Friend list" is enabled.

6. Enjoy the game!