“Say you like to jog in the morning and you’re near Central Park, but you don’t want to run alone because you’re in a new city,” says Paul Cahill, SVP of brand management at Marriott Hotels. “How do we curate those experiences and connect people with like interests?”

Cahill’s quandary is a unique one in the hospitality industry. Other popular hotels, like the Ace, or apartments booked through Airbnb, are designed to create organic social connections—the Ace through its leather couch-filled lobbies and the Airbnb through its hosts. But 80 percent of Marriott’s guests are there for business, and don’t have the luxury of fast-friending in the lobby, or pouring over guidebooks to sleuth out the best craft beer bar in the neighborhood.

Cahill took the problem to MIT’s Mobile Experience Lab.

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