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You will receive coins or a gem if one of your Facebook friends uses one of your characters in battle. Both you and your friends need to be connected to Facebook. If your friend uses your character you will see a number on the person icon under achievements. Tap on that and you see who used what character and what your “thank you” is. Your game does not need to be open for your friend to use your characters as partners. I have logged in and after a couple minutes, I can see who did what.
If you use a randomly generated partner, you benefit from having a side kick but I am not sure if the random user knows it. I only get rewards from my friends.