I can see how it is possible. Yes, most of us are pretty introverted by nature... in my personal experience though, my boyfriend is even less social than I am, and I hardly talk to anybody ever! It's hard to believe and makes little sense to me, lol, but it is true.
Then again, I'm kind of forced to at least be a little bit more social. I didn't say I'm good at it, but I try. With a kiddo in elementary school, I do have to talk to other parents at times-his friends' parents usually. My neighbor once said to me, "I thought you were supposed to be the one who stayed inside like a hermit and didn't talk to people." Apparently my bf never says hi back to her when he is coming to my house or anything. He just looks over, might wave, but that is it.
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Sorry about the incredibly long post...
"I enjoyed the meetings, too. It was like having friends." -Luna Lovegood