How do I play against a friend?
Real Boxing 2 gives you an opportunity to challege everyone from your Facebook list who has the Game installed on their phone. All you need to do is tap on the Friends section and if you have Facebook synced then you should be able to see the list of your friends.
Tap on the FIGHT icon next to their Avatar to start the fight. If they are online they should see the invitation. If they are currently away or busy then you will fight against their ghost avatar.