Foursquare co-founder Naveen Selvadurai was one of the surprise speakers at at PSFK CONFERENCE NYC 2011. At last year's conference in New York, Naveen Selvadurai talked about what foursquare is and why it matters.

He now gives an update to illustrate the future of the service, pointing to how the history of data that people collect about themselves can fuel powerful recommendations for people looking to better explore their city.

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