I don't think being in a city makes one more social. That being said, I have a close friend group who I don't live near. I meet plenty of people but having moved around a lot I don't have any close friends in my current city right now. I'm friendly with my neighbors but not friends with them. That's been true of just about everywhere I've lived, rural or urban.

I don't think I'd be more likely to make friends with my neighbors if I moved to the burbs. This seems to be driven more by personality and need than location, right?