When I look at my coworkers who are clearly extroverted I can see my network taking a hit. I know that eventually network is the strongest place to go to for job referrals down the road...any advice on what you've seen other introverts have done to break out of our shell?
You live in perhaps the best era ever for career-oriented introverts. The internet is your friend. Don't sweat it. Don't know what career you're aiming for, but if I default to some sort of software engineer it's worth noting that some seriously impressive folks run crazy popular and creative open source projects... but are also major introverts.
Never fear: Often the people who spend their time networking are not the ones who produce the best work. Letting the work speak for itself is far more powerful than a network. A balance is good, so push yourself, but if you find strength and passion in your work then trust yourself. Take credit for your stuff and the popularity will come.
On the internet nobody knows you're a dog, though that theory was challenged this week.*
* This is a 20 year old reference to two new yorker cartoons... so no worries if you have to google it.