PSFK interviews the co-founder of the foursquare - part friend finder, part social fame, part city guide service for your phone.

On one level, foursquare is a service on your phone that allows you to notify your friends where you are – especially useful if you’re on a night out in the city and you’re looking for where the next party is. On another level it is also city guide and a social game and on another it could even be considered a loyalty store card with discounts and offers.

When we met with co-founder Dennis Crowley in the office space he shares with a couple of other New York start ups, he admitted that even though thousands of people were already using the service they had only built 20% of what the team thinks foursquare will grow up to be.

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