6:54 minutes

When Dennis Crowley started Foursquare in 2009, he simply wanted it to be a playful experience for its users. Four years later, the location-based social network has reached the milestone of 3 billion check-ins. Crowley joined Rebecca Jarvis on \"The Start Up\" to discuss how his New York-based company is still continuing with its original mission, and now, helping people save money.

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