Same as Fb or Twitter, collect user data and eventually have some great monatization idea. If nobody has a good idea, you can always put AdMob or something on it "this bump was sponsored by ..." something.

The idea is good, the best way so far to say "Bluetooth sucks".

Perhaps. I considered this, but Bump data isn't exactly social.

Apparently they licensed their technology to Paypal to build their money-exchanging app. Maybe that's the plan.

Acquire users and sell out to facebook/google? But yeah, this would be interesting to know.