I am running a contest where I am giving away 5 $20 iTunes Gift Cards - GET A FREE $20 ITUNES GIFT CARD! ENTER NOW!!!! | Facebook

I'm looking for advertising except banner advertising - if you run a forum, then maybe mass PM or announcement, if you run a popular Facebook page then post it there. I'm looking for something that will spread this fast, something viral.

It should be targeted to teens (the iTunes-using population), and good ideas are iTunes/Ipod/Music/Off Topic/Teen related forums or just popular, fun Facebook pages.