Who pays for us to play?

Social apps try to make money by selling the data they collect from users to businesses, the lastest: Foursquare.

Checking in with Tristan Walker of Foursquare (via Restaurant News)
Q: Some restaurateurs have said they’re testing an analytics dashboard for Foursquare, where owners can pay to create custom offers and badges. Is that coming soon?
A: Yes. We hand-selected about 30 of our most passionate venue owners to test this. All of them care about two things: retention and acquisition. We help with acquisition by letting you see who comes in where, when, and where they go before and after they stop in.