Seems pretty easy. I suggested that friends could share 1 account across multiple iPhones to collect areas in two different parts of the world at the same time.
In any case, someone was really sneaky here in Ottawa. I came back from vacation and checked the map and was relieved to see that none of my territories were taken. Until I noticed that my attacker was using the same colour as I was, so I just THOUGHT nobody attacked me. The jolinar is a sneaky SOB.