Is there any script or plugin or anything that can make auto affiliate or refer-a-friend links? Think of how groupon is. After you place an order, you don't have to 'sign up for our affiliate program!" They just give you a special link, and if like 5 friends order through your link, you get your program for free. Doesnt have to offer the thing you already bought for free but same auto tracking system. Anybody know of one? Thanks!