Great question. I am a fairly gregarious person who has never really had a problem with loneliness. I actually enjoy being with myself. Not by myself but with myself. I did the typical backing trip to Europe after university where I was looking for my future and brought The Art of War and some other soul searching books and wanted to spend months with myself and ended up having 2 days without people with effort. That is pretty typical of the way things work out for me. That was many years ago. Recently I moved to a place where I just will not have friends nearby for human contact and have no desire to interact with the locals. So anything but Facebook is good. :) I am lucky enough to have dozens of decades old friends that I get together with on a regular basis. 20 days until our next big meet-up. Old friends are the best friends for me.