I do believe that we are becoming an increasingly social society. It could very well be the era of introversion to extroversion. With this evolution and transformation, we’re concurrently subject to a greater set of distractions. And as such, we are sidetracked by choice and free will. But, as this is the dawn of the great attention economy, and new tools such as PeopleBrowsr, Seesmic, CoTweet, Facebook, and TweetDeck become our attention dashboards, those of us active in the real-time Web must experience an evaporation of attention span and our ability to digest and respond to everything that moves us.
The problem here is the definition of extroversion and introversion. The two relate to energy, not degree of socialization. Someone who is extroverted craves the energy of people. They need to be surrounded by people or else they feel 'off' in some way. An introverted person is the opposite; they need alone time to recharge their batteries. That doesn't mean they don't enjoy socializing; it's just that too much of that one thing makes them tired.
I'm an introvert. Although I have taught myself to be good in social situations, after a day of socializing I want quiet more than anything else. I don't see anything in 'social' media that rewrites that definition. I bet that most people who are extroverted never tire of telling the world everything. My most extroverted friends update their Facebook status constantly. Introverts are more likely to engage with social media more sporadically or in a more planned fashion.
Of course this is conjecture but it would be an interesting study to analyze the difference between the two personality traits and their engagement in social media.