By Nic Fleming Dennis Crowley, head of location-based social networking site Foursquare, says the app is no stalkers’ paradise Can you explain Foursquare for non-users? It’s about making cities easier to use. It lets you “check in” to places from your cellphone. You can then share your experiences by leaving tips for your friends. There are also game mechanics. Users are rewarded with badges, and if you check in the most somewhere, you become the “mayor” of that place. Why would I want to be the “mayor” of my local pub?