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At some point in the recent past I gave in and signed up for Identica and Twitter. I'm now simultaneously posting to both these services and Facebook via Gwibber. (I grabbed the Ubuntu package from Launchpad since the Debian ITP has been stalled for some time.)
In one way, I've been microblogging for some time via Zephyr. But I sometimes feel limited by the fact that it only puts me in touch with the MIT community (and only a subset of that, even), so perhaps Twitter/Identica will prove a better solution.