I know almost nothing about Facebook apps Ashley (I stopped using Facebook around the time apps were introduced, hopefully I've been 'sacrificed' to feed my old friends). But, I was assuming BK would use/sell the email addresses again in the future. So does BK actually get their hand on the email addresses?
I think you should double check the facts with you econ teacher
and the best re-use of a newspaper is folding it back up and putting it back on the stack