Where can i post my cupons online so that people can only print them off once?

[River]

I am managing all the computer information and online marketing for my parents' restaurant. i imputed all of our menu on facebook and he wants to put on a coupon, but he wants it so that customers can only print it once!! i am looking to keep this completely free and online we want it to be a facebook app for our first choice or a website we can post our coupons on as a second,
thanks a ton!!!!

[dennis_loh]

I personally think that you cannot prevent your customers from printing coupon more than once. Even if you can restrict them doing so online, but don't forget that we have a "print screen" button on our keyboard. Therefore, they can still print hundreds of copies offline. The only way to restrict is to add in a unique coupon code to prevent them using it more than once.