Shake Shack New Years Promotion: Order 2 burgers and get the second one for free

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This December, Shake and Shack has a special New Years promotion for all of you: For a limited time, visit their online store or download their app to order two burgers and get the second one entirely free! All you have to do is enter the promo code THANKYOU at the time of checkout. Registration to the app is required. Terms and conditions apply.

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