Twitter is a kind of IM (instant messaging, for those of you even squarer than me) for web browsing. It used to be mainly for …; well, anyway, people who can’t hang around waiting for the email to come through are increasingly adopting it.
Read more about Twitter, including a neat little video, here.
p.s. I’d like to finish off with a “tweet tweet”, but your groans might be spared in case there’s a letter of demand out there somewhere.