On stage at TechCrunch Disrupt earlier today (RIP, Sam Biddle's press credentials!) Foursquare CEO Dennis Crowley acknowledged the haters, before offering a confident dismissal: "I think there are a lot of people that think we don’t know how to generate revenue, that we aren’t generating revenue. This is wrong," he said. An internal Foursquare document obtained by Valleywag shows some of the new ways Foursquare is trying to make money: Tell advertisers where you've been.