Just noticed "facebook offers" coming up in my timeline, looks similair to coupon sites with a better chance of going viral. One fanpage offered a supplement disc and had 3,000 offers taken (the fanpage only had 6,000 fans!). The offers get directed to a fans email addres with instructions on how to redeem offer. Google "facebook offers", I just registered my Fanpage (FB offers in beta atm) with FB. Not sure if anyone was aware, sorry if old news.