You can use your Google+ account to connect with your Circles in Paradise Bay!
First, connect your game to Google Play by tapping the 
button in the Settings menu 
. This will connect your current Google+ profile to the game.
Once the game is connected, Google+ friends who play Paradise Bay will appear in your Friends list! Both players must have one another in their Circles to see each other in-game.
 The above is Quoted in part or full directly from the Official Paradise Bay FAQ |