A great bad idea.

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Whenever a user makes a purchase online, they are given the option of a small discount if they agree to have the company post that they’ve purchased the product on their Facebook profile. The fiscal size of the discount could be based on the number of people who are capable of seeing the purchase was made (number of friends, privacy settings, etc). The option of having a rolling discount (the company pays the buyer over time) based on how many users click on the post could be added but there’s a great chance that malfeasance would occur with this.