Do I Have My Head in the Sand?

Lately I've been doing a lot of reading and listening to vodcasts about networking and networked learning. Essentially, it is the way in which individuals learn, acquire knowledge and communicate on the web these days. It has been called Web 2.0 or Classroom 2.0. It is all very interesting but I am still finding that I'm not sold on communicating with perfect strangers about anything from how to create classroom community to how to make a blueberry pie. I am a private person, and even blogging has been a challenge for me. I understand the benefits of communicating thoughts and ideas as it solidifies one's beliefs and extends one's knowledge base. Yet, I can do that by talking face to face with my colleagues and journaling in private.
George Siemens has put together very compelling vlogs on the impact of social software on learning. One of the things he says is that "our knowing increases as we externalize our knowledge." This is based on Vygotsky's theory that "words give life to thought." Basically, the more we express our ideas, the wiser we become. Isn't that what Aristotle taught as well? I see the merit in dialogue, but can't learners become knowledgeable without networking on the Internet? It worked for the Greeks.
I dread to think I have my head in the sand. I know that social networks are the way of the twenty-first century. However, right now I am not on the band wagon. I do not subscribe to Facebook, Netvibes, RSS feeds. I have a Twitter account but I never use it and I only blog infrequently. I like to think that I am aware of these sites and that is enough. Am I in denial?