Communication distance

I think that people usually prefer to keep a middle distance on their daily interactions with others. They feel unconfortable being strangers, so introducing to people that surround them makes them feel better. However, coming very close to each other also makes them feel uncomfortable for various reasons.
But this may be a little offensive. Imagine that you 're in a bus or a train and the next seated person introduces herself to you. You get to know each other and then you lose contact. What happened there? Have you been used to help an unknown pass the boring time of commuting? During this time you could have done something more productive for you.
That is the case of people doing networking. They create contacts, sharing every now and then pretty much useless information to keep the contact alive. Sadly, it is usual that when a contact needs them, they can't be available. They can't afford so many contacts and they are not really interested in all of them.
So if we define as micro-distance how easily you make connections and macro-distance how easily you get close with a connection, then, speaking of myself, I would have a very short micro and a very long macro. This means, it's very easy for me to get introduced to people, but it is hard for me to have a stronger relationship with this contact. It seems that it is a quantity-quality issue and though I prefer quality, I give priority to quantity.