That's not what the description for the Shakedown app says, but that's sort of what it does. The $1.99 app is linked to Foursquare and will send you "notifications whenever your friends are holding you a spot on line" at Shake Shack in Madison Square Park. If you're the person in line, you can use the app to let your friends know you want company and how many people are in front of you. And to think all this time I've just been waiting in line sans iPhone like a luddite. [via The Awl]
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