Dens: Naveen and I built half of the original foursquare prototype here (pre-SXSW 2009). This was before I was drinking coffee, so I was downing like 5 hot a day here (someone's gotta pay for that wifi!)
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Dens: Naveen & I built 1/2 of the foursquare prototype here (mostly at the back table near the bathroom). The "mayor" feature in 4SQ came from our buddy Chad making fun of us for camping at that table :)