When connecting your game to Facebook, you may have opted not to share any information to the game. With this selection, we cannot retrieve your friends list to display it.
As Facebook keeps changing its terms on a regular basis, you will need to contact them directly and request for their help to modify this setting via the following link: https://www.facebook.com/help/
As Facebook keeps changing its terms on a regular basis, you will need to contact them directly and request for their help to modify this setting via the following link: https://www.facebook.com/help/