Ask HN: What is BangWithFriends? Edit: a Facebook app that where you can click on friends you want to sleep with. If they have the app, they are notified. I would think this would be more cool if both of you are only notified if you both signify that you want to sleep with each other. This could also be toned down to just signify romantic interest to get more engagement.
I ran into this years ago in it's email incarnation. I think it was something like you'd get an email that said someone had a crush on you and then you are supposed to put in emails of other people and if there was a match you'd be notified. The problem was you didn't know who sent the email so you'd probably put in the emails of all your female contacts (or vice versa, etc) and then all of them would get emails. Logically it was an email ponzi scheme where if you didn't see the inherent problem from the beginning you probably ended up really confusing a bunch of your friends.