Burger King is offering a free Whopper to any Facebook users who are willing to sacrifice ten friends. (This means removing them from your friend list.) Burger King will then notify you, via Facebook, how to claim your Whopper. Deal ends January 15.
Note that after friends have been sacrificed, it's still possible to re-friend them.
Interesting..can't believe people will go through all that for one burger, but it seems as if almost 18K already have based on the numbers on the site.
Read more about it in this AdWeek article.
FYI, BK also produced the Subservient Chicken and Angry Gram apps.
NOTE: Looks like the Whopper FB app was the thing that was sacrificed.