I see from the article this is old, I never heard of this and thought it was the funniest thing i've seen happen on facebook lol. Delete 10 Facebook friends, get a free Whopper Fast-food chain Burger King's new Facebook application will give you a coupon for a free burger if you start trimming that friends list. What it won't do: trim your waistline. (Credit: Burger King) Facebook's developer platform has been used for a zillion marketing campaigns so far, but this one is actually dead-on hilarious. Fast-food chain Burger King has created "Whopper Sacrifice," a Facebook app that will give you a coupon for a free hamburger if you delete 10 people from your friends list. Burger King has put out some interesting campaigns as of late ("Whopper Virgin," "Subservient Chicken"), but this one piques our interest because of how gleefully it pokes fun at our social-networking obsessions. "Now is the time to put your fair-weather Web friendships to the test," the Whopper Sacrifice site explains. "Install Whopper Sacrifice on your Facebook profile, and we'll reward you with a free flame-broiled Whopper when you sacrifice ten of your friends. The funniest part: The "sacrifices" show up in your activity feed. So it'll say, for example, "Caroline sacrificed Josh Lowensohn for a free Whopper." Unfortunately, you can't delete your whole friends list and eat free (however unhealthily) for a week. The promotion is limited to one coupon per Facebook account. My Facebook friends had better appreciate the fact that I made a New Year's resolution to cut out red meat. Hint, hint.