Facebook users can "check in" to physical locations via their mobile phones through the Facebook Places feature. You can offer a discount to any customer who updates their status on your Facebook place page. Have them show the cashier that they have updated their status. There is a similar feature at Foursquare that might work for you as well.
Try creating an account on Yahoo and search through Yahoo answers. This website allows users to submit questions and get answers from other users.
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