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. January 10, 2009 by Mark Walz, Jr. Burger King: Delete 10 Facebook friends, get a free Whopper Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related