Twitter is like telepathy. You get to know what people of interest to you are thinking in a continuous stream.
Twitter is like eavesdropping. You can listen in to conversations between smart/witty/angry people.
Twitter is like talkback radio. You can jump in with opinions and suggestions.
Now to convince more people in Adelaide to use it 🙂
There are lots of Adelaideans on Twitter, but we mostly hide. I’ve got a big network on Plurk now so that’s my motivation for organising BarCamp (I go across three social networks! :))