Be careful Rhapsody; it's so people can find other people and join them; that means the other people your son plays with can "see" you (and potentially connect/hack into you). As the main page advertises, "See what the friends of your friends are playing." It's not a program in its own right, it's the development of a piece of programming that's open source. Anyone can twiddle with it, make whatever they want out of it.