Stunning work from Mini Germany. Till the 29th of May anyone (even people outside of Germany) can use the above facebook app to get their picture on one of the main billboards in Berlin + stand the chance to win a Mini of your choice!
No idea who the agency is but go to http://apps.facebook.com/miniphotobox/ to enter and try it out for yourself. Similar idea to the Corona beer New York Times campaign from late last year.