But this isn't the first time technology like this has 'shrunk the world' and shone a light in dark places- In 1991 the news of Soviet coup d'état attempt was carried over IRC despite a media blackout in the country. Reports from the first Iraq war were carried over its channels as well.
And IRC is as old as the hills. In spite of that, It's always allowed for realtime group conversation -or- private one-to-one dialog. You don't need to create an account, big personal network, or audience of followers to start-up and jump into a conversation. You can monitor channels of topics and come and go as you please. It's a pretty damn efficient twitter, way before Twitter (and cell phones, text messages, even AIM for that matter)
What Twitter's done to the individual messages of SMS (and by extension, chat & IRC) is marry them to hosted nature of the world web web. Individual statements in 140 characters, published as html documents; those documents aggregated into user profiles & feeds.


