Introversion and extroversion can differ significantly, depending the "setting". Meaning that an online setting may convert an introvert to an extrovert - because there is the "barrier" of non-real-life-interaction which the introvert may subconsciously fear.

In fact, I'd go one further and say introverts may be the best posters online, by far - while extroverts, being more the "real-life" type of guys, may be more "unsuited" for the online world.

Bottom line: Introverts need no re-inforcement. They're -usually- already at the top of their game in the online world. On the other hand they may need to solve the issues that make them introvert to improve their RL interactions.