Philip Kaplan (aka @pud) posts this old article from 2006 about the introduction of Twitter. Thanks to Matthew Holt (@boltyboy), author of The Health Care Blog, for retweeting.
The article was wrong about one thing, perhaps reflecting a social-media induced change in social morays with regard to privacy:
There is also a privacy issue with Twttr. Every user has a public page that shows all of their messages. Messages from that person’s extended network are also public. I imagine most users are not going to want to have all of their Twttr messages published on a public website.