Shake Shack is giving away free burgers - here's how to get one for you and a friend

Marina Nazario/Business Insider

• Shake Shack is giving away free burgers from Monday until Sunday.
• If you use Postmates to send a ShackBurger to a friend who doesn't already use the delivery app, you can get a code for a free burger of your own.
• Postmates is also offering free Shake Shack delivery all week.

Shake Shack is giving away free burgers this week - if you use Postmates.

On Monday, Postmates and Shake Shack announced that you can score a free burger for yourself and a friend all this week.

From Monday, December 11, to Sunday, December 17, Postmates users will receive a $10 credit towards a ShackBurger if they send a free ShackBurger to a friend who doesn't already use Postmates. Basically, both you and your friend can get a free burger if your refer them to the food delivery app.

Postmates is additionally offering free delivery on all Shake Shack items until December 17. Both the free delivery and free burgers will be available in 17 markets, including Atlanta, Austin, Baltimore, Boston, Brooklyn, Chicago, Dallas, Houston, Los Angeles, Las Vegas, Miami, New York City, Orlando, Philadelphia, Phoenix, San Antonio, and Washington, DC.

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