Foursquare's Hypertrending app uses Pilgrim, its SDK used by thousands of apps on millions of phones, to show where people congregate in Austin, in real time (Dennis Crowley/Foursquare Intersections)

Dennis Crowley / Foursquare Intersections:
Foursquare's Hypertrending app uses Pilgrim, its SDK used by thousands of apps on millions of phones, to show where people congregate in Austin, in real time  —  Where 10 Years of Foursquare Has Led Us  —  It's been 10 years since we launched Foursquare at SXSW in 2009.

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