Whether it has been shut down by
Facebook, as written at
http://www.whoppersacrifice.com/, I think this was one of the best ideas of online marketing. In fact it was a campagin which combines digital medium with off-line environment and I believe it has reached it's target. Whether you name it as digital marketing or online marketing, it works!
It was not applicable in all countires due to certain reasons I believe but it was successful. Offer was simple; would you sacrifice 10 friends (from

your Facebook friends) to have a free
Whopper? Check out it's Facebook
application for comments. Some people are happy with their free whopper and some are disappointed because of it is disabled. One user wrote "
Great idea from the Burger King marketing department. Shame on Facebook for disabling it"
So why such an idea, which use digital medium and does online marketing in a different way, has been disabled? There are various non-sense applications at Facebook which deserves to be disabled but not this!
... but what if this is also a setup? :)