Twitter is picked up considerably in Australia in the last year.. This hitwise chart shows Twitters usage has increased 518.2% over the year… This chart only showing web usage, so that number is definately larger as twitter is a multi device platform.

Thanks to Sandra Hanchard at Hitwise for the report
The growth of twitter has been aided by the surge in mobile internet devices such as the iPhone, allowing users to tweet on the run! and now even geo tag their posts starting conversations with fellow micro bloggers in their vicinity..
Twitter still has quite a niche geek/uber cool advertising type
following, and is definately a great distance from being mainstream. (Im getting a bit bored of explaining what the “Twinkle” app on my iPhone does..). Corporations are catching on, and realising that twitter is being heavily used by this “in the know” crowd, which provides a great oppurtunity for marketing and conversations to be had between these companies and their potential customers. I personally follow @VirginBlue, @forrester, @SBS not to mention i also have being enjoy news updates from the likes of @news_com_au and @macdailynews and enjoyed getting all my olympic updates from @AussieOlympics