"Evan Prodromou, one of the better citizens of the wiki
community and founder of WikiTravel, launched Identi.ca today. Its
a Twitter clone that is also distributed as Open Source licensed
software. I've been playing with it in semi-private beta. From the
"The goal here is autonomy--you deserve the right to manage your
own on-line presence. If you don't like how Identi.ca works, you
can take your data and the source code and set up your own server
(or move your account to another one)..."