Dennis Crowley On Using Foursquare To Build The ‘Marauder’s Map’

A lot of people might think of Foursquare as that checkin app with badges and leader boards and finding out where your friends are. But it’s a lot more than that now, thanks to all the map data and information that they know about places people are going to.

In a conversation onstage at SXSW with Anil Dash, Foursquare CEO Dennis Crowley discussed the company’s evolution from an app that was primarily focused around helping people to find their friends, to finding out more about the world that they live in.

Crowley said that one of the underreported stories is the number of companies that rely on Foursquare’s map data and what developers can potentially do with that. The place database has more than 50 million places of interest in it, and it changes frequently. Users enter new places as soon as they open up, and signal places that have closed down.

When talking about the map data that it has, Crowley compared Foursquare’s check-ins to Google’s web crawlers scanning the Internet for new websites. “People tell us about the places that are interesting, the places that are no longer interesting,” he said.

More importantly, the company isn’t entirely dependent on just its users anymore for a lot of its data. Thanks to the Foursquare API, the company gets location data from lots of different apps. For instance, every Instagram picture that has a location attached to it sends a data signal to Foursquare about that place of interest.

In that respect, the relationship between Foursquare and its API partners is kind of symbiotic: Foursquare has one of the best map data sets out there and makes it available. In exchange, it finds out more about the places that its partners’ users go to.

At the end of the day, the data that Foursquare has is the ability to provide more personalized maps than what is available today. Crowley said that maps haven’t really changed that much since people started making them, but now that we have certain amounts of trending data or interest data, Foursquare could help make the places that people see more meaningful to them.

Crowley likened that to Harry Potter’s “Marauders Map” and how it provides Harry with details about the people and places around them. “There is enough data that we should be able to make that Harry Potter map and give it to everyone in the room,” Crowley said.