I think the extrovert/introvert model is flawed. I think most people need to socialize, and get energized being around people, and the same people need alone time to recharge. I think that's just human nature. I know many people who spend all day on their computer, like myself, will say they're introverted because they're not out socializing, but the truth of the matter is, they do take part of online communities. They either socialize through social media, games, or they develop para social relationships. Take away their internet and you'll see how introverted they are once the withdrawals kick in.

I believe more and more people gravitate towards online interaction, because it's easier. You don't have to put yourself out there. You don't have to be vulnerable. It's safe and easy. You're satisfying a need, which neglects the growth of offline social interaction. Which is why so many people believe they're introverted, when in reality, imo, they just never developed the skills to make offline social connections.