Quiet Bloggers - an observation

According to the book 'Quiet: The Power of Introverts in a World That Can't Stop Talking', people who are introverts are likely to express themselves more in social media - especially blogs. This brought to mind my fellow B-School bloggers from Kellogg - Orlando (with two blogs now), Dino and Jeremy. All of which were part of the Clear Admit top 10 student bloggers. None of us seem super introverted, but I think on the balance, all 4 are just slightly introverted. I know these results probably don't count as statistically significant, but Susan Cain seems to be on to something!