Facebook has a huge opportunity here to build the mobile payment killer app. If they can get this integrated with NFC, you can pay for the tab at a restaurant and split the check among you and your friends. Realistically, you could use it to split nearly ANY bill - Facebook just has to build an interface.
The only question is if the payment processors and Apple/Google will leave the door open wide enough.
The only question is if the payment processors and Apple/Google will leave the door open wide enough.