@einsley, i can show you what i did for one of my client recently. They are basically carpet seller in australia and they are aiming at giving free carpet door mat to fb fans who make a purchase of over $100 during valentine week. I think you can also design such promo. To see it in action click hereFirst design a welcome page that will be default for non fans, then install a fan only coupon for fans who liked the page, and give there a print button so that after liking the page, when fan see the coupon they can print it and can bring to client’s store when they come for availing service, this way client will be able to identify those who came via fb and thus client will be able to offer free service