An article from Wired Magazine suggests that the Internet is a sort of social super-glue, facilitating connections between people. As a result, they want more face-to-face contact and find it in cities.
In big cities, our communication tools are especially helpful because they keep us from getting lost in the crowd (which is not something you worry about in a one-street town). There are even services that tell you where your friends are by locating their cell signals.
Facebook, the new urban planning tool :-)