Are you Team Burger or Team Chicken? 🤷🏻‍♂️ #ShakeShackPartner @SHAKE SHACK is letting the FANS decide which Shake Shack sandwich will be FREE* starting 3/16. YES I said that right FREE. Head over to your Shake Shack to submit your vote or stop by participating Shake Shack locations to shoot your shot! *terms apply #marchmadness #burgers #shakeshack