http://www.freeculturenews.com/?p=63 says:
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Identi.ca has launched. It's a microblogging service that runs on AGPL
software and content posted is considered CC BY.
Identi.ca is a microblogging service brought to you by Control
Yourself, Inc.. It runs the Laconica microblogging software, version
0.4.0, available under the GNU Affero General Public License.
Unless otherwise specified, contents of this site are copyright by
the contributors and available under the Creative Commons Attribution
3.0. Contributors should be attributed by full name or nickname.
They've even implemented OpenID right, so that you don't need an
account. And you can post with XMPP! Very free indeed. Goodbye Twitter.
***
