Susan Cain's book, Quiet: The Power of Introverts in a World that can't stop talking has basically started the introvert movement.
"There's zero correlation between the best talker and having the best ideas."
"Don't think of introversion as something that needs to be cured .... Spend your free time the way you like, not the way you think you're supposed to."
"Solitude matters, and for some people, it's the air they breathe."