Back in 2008 I presented a paper at OZCHI in Cairns, and met a few of my research heroes. I documented the experience on Twitter, but despite my optimism at the time there is no longer any trace of those tweets [2018 update: they're back at a new URL].
So this year when I attended the workshop on Public Art, Evaluation and HCI I left twitter behind and posted on alpha instead. So for now at least, you can read my observations of our various contributions there.
[2018 update: sadly the Twitter challenger Alpha is gone entirely - but the Internet Archive has it.]