The best would be to get multiples of 3, because that would be, in my opinion, the most advantageous. So, if you want to get the best possible reward, log into the game every 6-7 hours, and start ...

Invite friends and get free spins Every time you invite a friend to play through Facebook ... if luck is on your side, simply spinning tends to result in free spins when you line up 3 Energy ...