The big virtual currencies - Facebook credits, cash and coins in Zynga games - don't work like regular currencies. You can't exchange them for cash, you can't s

The big virtual currencies - Facebook credits, cash and coins in Zynga games - don't work like regular currencies. You can't exchange them for cash, you can't send them to other people, and at any time the entity that controls the currency can change the amount you have. So a third-party bank doesn't make much sense. The companies that created the currencies want to retain control over them.