What are the ‘advantages of Foursquare’? Learning about engagement around location

As I was live-tweeting an interview of Foursquare General Manager Evan Cohen Tuesday, Joey Kulkin asked a good question:

https://twitter.com/#!/incrediblekulk/status/128938520239800320

I promised an answer:

https://twitter.com/#!/stevebuttry/status/128939014513364993

So here goes. Why do I “check in” every time I eat at a restaurant or attend an event (or even at each train stop as I roll home from New York tonight as I write this)?

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