I was having breakfast at Pastis with a friend today. The "mayor" of that restaurant, Mark Ghuneim, walks in and goes to the bar to order his morning coffee to go. I said to my friend, "watch this, he's going to pull out his phone and then look up and and try to locate me in this restaurant". My friend, who is not on foursquare, says to me "how do you know?" I said "trust me". Sure enough, Mark starts looking around the restaurant and spots us and comes over and has a ten minute conversation about web music stuff (and foursquare).
When I checked in this morning at Pastis, I added a shout that said "getting a demo of a hot new web music service". The CEO of Targetspot, Eyal Goldwerger, saw that on his phone and jumped in a subway to come down and see the demo too. Sadly, we had left by the time he got there.
But both anecdotes are examples of why foursquare has such potential. It seems like such a simple and whimsical service. You just checkin to places via your phone. But the data that it creates and the way it is published out to your social graph is powerful. I expect we'll see a lot more of this sort of thing as the user base on foursquare hits six figures and hopefully seven figures in the coming months.
Disclosure: Foursquare is a Union Square Ventures portfolio company.
