I don't think i look people in the face. I just feel their emotions, so i don't miss anything not being able to see their face.

There was an article about how often you see people and how friendly you are.

When you live OUT on a farm and see people in town once in a while, you are polite, tend to stop and chat a bit.
But, when you are in a city, you see so many people that you barely give anyone the time of day.

I have seen it in action, but i am not sure it is a cause or an effect.

I always try to tell the grocery clerk a joke.