I bet you there are more than a few people here that would disagree with that statement. (I'm not one of them, but I know that there are people making a killing on Facebook right now.)

My stance would be that all those money making apps would do just as well, if not better, outside of facebook as well.

While that's entirely possible, inside of FB you have the benefit of already knowing who the user's friends are.

Actually, it would be kinda neat to have strangers nominate two people for a blind date... wisdom of the crowds after all!