I am taking the big step of posting on Twitter.
To most people, Web 2.0 simply means they can share info with the world or some portion of it (friends, colleagues, etc.). To me it means a big risk in sharing with people I don't know. I've never been shy per se, at least, I get nervous when talking in front of a crowd but that usually fades about 2 minutes in to the talk/discussion/presentation/whatever.
But the Internet is forever, in a way. This is different.