There is a limit of 10,000 requestors for each coupon. 25,000 for the BOGO goal.
Butterfinger's Like-o-Meter promo on facebook, go to their page and like them, right now you can download a $.10 coupon. The goal is 800,000 likes and then you can get a BOGO coupon.
740K gets a $.20 coupon
750K gets a $.30 coupon
775K gets a $.40 coupon
800K gets a BOGO coupon