We're not going to judge you if you spend money on Facebook credits for games. Sorry, that's a lie: we completely judge you. But if you are flinging money in Zynga's direction, Optus adding the ability to put those charges on your monthly phone bill could be a welcome development.
Optus has rolled out a new partnership with Boku to enable the purchase of Facebook credits which are then charged to your monthly postpaid bill. When you make a purchase, you receive a text message asking for confirmation, which should cut down on the potential for abuse. There's no such deal for postpaid customers. For postpaid customers, using your bill certainly seems better than submitting your credit card details into Facebook's often hopeless security systems.
Optus has also enabled BlackBerry owners to charge BlackBerry App World purchases on their monthly bills. Telstra added a similar feature late last year.