Facebucks, how to monetize Facebook...

It occurs to me that Facebook users really want to spend money, but there are limited opportunites within the Facebook environment and no micro-payment mechanism to help the process.
By allowing each Facebook user to have a balance of Facebucks to spend on all the crappy apps/services that are available out there, the company could rake in loads of cash.
Just give away, say 100 FBs per hundred friends, and then allow the apps to charge for usage, with Facebook taking a percentage on conversion of FBs to real cash.