Mike Isaac @ AllThingsD:
It works the same as all other purchases made through the Gifts product. Choose an item to send to a friend through Facebook (in this case, the iTunes digital gift), and you’ll pay via your credit card through Facebook. Right now, most of the options Facebook offers are physical goods like food, toys and apparel.
If you keep your eyes open, deal can be found for physical iTunes cards for up to 20% off. While Facebook giving won't be the cheapest way buy gifts, it's pretty convenient. Assuming of course the other person is a Facebooker.
AllThingsD
