An interesting choice of words there from Foursquare founder Dennis Crowley. Auto-check-ins aren't here yet, he explains, but they would be a "natural progression" of the location-broadcasting we're already doing now.

Someone do a little napkin math: will Foursquare make more money by a flood of inadvertent check-ins, or lose money when people flee the app because it's checking you in at strip clubs and seedy bars your ex frequents without asking you first?