interesting. no way to do that in twitter either.

wah.

micro-blogging is not the same as instant messaging.

i hear steve gillmor thinks differently.....

Steve Gillmor is wrong.

i believe you.

twitter is most definitely a messaging system but presence shouldn't be a part of it unless that specific gesture is made by the user

the overall context of "messaging" in a micro-blog is different, which defers the need for presence detection.

I'd argue that presence in blogging in general (micro or not) talks to the message, not the author.