My predictably unpopular theory is that highly social people are really afraid of other people. Perhaps not without reason if one regards other humans as potential predators. So they designate a group of people friends and use it as protection against all the other people.
Yet they remain afraid, and this fear is what makes social interactions addictive (like gambling; the great the fear the greater the high on the occasions when you don't lose).
Yet they remain afraid, and this fear is what makes social interactions addictive (like gambling; the great the fear the greater the high on the occasions when you don't lose).