Why social software is good for introverts

The Power of Many points to an intriguing post at 12 frogs, of particular interest to introverts:

... Thanks to LibraryThing (now with Groups!) and Flickr, my books and photographs have more of a social life than I do. I like things this way. It may seem counterintuitive to extroverts, but social software works for me because:

• Social software is mediated communication
  ... it means avenues of communication are only as open as I want them to be...

• Social software maintains the strength of weak ties
  ... The problem with this theory, if you are an introvert, is that you probably put zero energy into maintaining your social network ...

• Social software can create pockets of quiet and focus in the noise
  An odd thing sometimes happens when you aren’t standing in front of the crowd in person — it ends up being easier to get more personal, not less. Because you don’t have to think about the crowd (maybe there isn’t one after all) you can post the photographs you love, say what you really think, and tell the story your way.

  ... Connecting online counts. It matters to me, sometimes I’m surprised by how much.

I wonder if introverts use the web more than extroverts? I wonder if it seems more significant to introverts than to extroverts, who are more likely to have a broad and busy IRL social life?

It's certainly true for me that I feel more comfortable being personal, being who-I-am, online, than off. Generally, not universally, speaking. It's more like an exploration, than a revealing, somehow.

But then, we know that I'm an introvert. Are you more one than the other? Do you think it makes any difference at all in how people behave online, which end of this continuum they tend toward?