Dennis Crowley, the founder of Dodgeball and Foursquare, shares that fascination. When I first talked to him about Foursquare, he told me that he “tries to build things that make cities easier to use”.

People are good and trustworthy and generally just concerned with getting through the day,” Newmark says. If most people are good and their needs are simple, all you have to do to serve them well is build a minimal infrastructure allowing them to get together and work things out for themselves. Any additional features are almost certainly superfluous and could even be damaging.