[Aliantha]

It seems pretty clear that most of us are a bit of both as far as extrovert and introvert goes. In large part, it's because we're all different, and find different things comfortable while others we're more nervous about. Mostly this is due to social conditioning and also at times (speaking for myself) due to health issues etc.

I wouldn't say either is more important or valuable to society. If we all spoke at once all the time, imagine the mess we'd be in then. I'd also like to point out that extroverts aren't just noisy people. Sometimes the extrovert has the least to say of anyone, but there's a certain charisma about the person which draws people in. Again, I think it depends on the situation though.