Connecting your account to Facebook has many advantages!
All your Facebook friends who play Spades Royale will have you added automatically, you can send each other coins, invite other friends to Spades Royale to receive additional bonuses, and you can transfer your account between devices easily without losing any progress!
In order to connect your account to Facebook, all you need to do is click the "Free Coins" button inside the game located in the lower area of the screen, and then in the Send/Collect tabs you can click on "Connect".
Press "accept" and that's it! Don't worry, this doesn't allow Spades Royale to post anything on your account