Here's something to brighten up those winter blues! Shake Shack is celebrating the launch of it's first-ever mobile app by... giving away free burgers! Just RSVP below, enter code "shackappy" into the Shake Shack app, and a free ShackBurger is all your's! Free Shake Shack Burgers - RSVP Must RSVP above. Redeemable at all NYC locations (except airports & stadiums) until Tuesday February 28, 2017.
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