Any ideas on applying a coupon via popular social media and advertisement methods of the day? That is to say click here special offers on external sites that apply a promotional offering/code? I was thinking of writing a small project to establish this sort of functionality. I was thinking simply checking the url and firing a rule to check the url and if so assign the coupon to a user with the option to limit one per user.
Before going down that path, I figured I'd check to make sure such functionality is not already available or that someone else does not have an idea on how to complete this common use type in a more simple manner.