I've lived in NY, MD, DC and now TN and I can say Tennessee was a shocker. Everybody talks to everyone here about anything. Here's a good example:
I had to go to Wal-Mart when I first moved here as I didn't bring with me a lot of little things for the kitchen. So, I'm standing with my cart on the checkout line and there is an older couple in front of me. It happened to be the time when Queen Elizabeth was visiting the USA and the cover of one of the checkout tabloids intimated she was having an affair with President Bush.
The lady in front of me was so disturbed by this she turned to me and asked if I thought it was true and told me how bad she felt for poor Laura (Bush not me) if it was true. She was a very sweet older lady and genuinely concerned.
People here chat you up in the Post Office (doesn't matter how long the line is), in the doctor's office waiting room (about their kids, their boyfriends, their kid's teachers), in the restaurants, at the car dealership, etc., like you've been good friends all of your life. Even the doctor spends a lot of time chatting with me - way more than any doctor in any other state ever did.
I think I've told this story before but the first time I brought my car to the Subaru dealer here for regular oil change and service, I asked if they would replace my windshield wiper blades. They did. Later that week it rained. They called me at home and asked how the wiper blades were working out for me. I almost fell off my chair.
I rather like it. I think they are nice people to be so friendly and courteous.