If anybody considers Twitter and other status-update tools all about self-exposure (I don't, but glad to "talk" with you about that in Twitter, Facebook, email, or the ConnectSafely forum), and consequently all about youth, the Pew Internet & American Life Project has evidence to the contrary - just out today. It found that "one out of five Internet users now say they use Twitter or some other service to share status updates about themselves, or to keep tabs on others." That's from a survey of adult Internet users - 2,200 of them. The 19% who now use status-update services is up from 11% last April. Here's more in a Wall Street Journal blog.