Identi.ca is a micro-blogging service based on the Free Software StatusNet tool.
If you register for an account, you can post small (140 chars or less) text notices about yourself, where you are, what you’re doing, or practically anything you want. You can also subscribe to the notices of your friends, or other people you’re interested in, and follow them on the Web or in an RSS feed.
Offsite — About > Identi.ca is a microblogging service. Users post short (140 character) notices which are broadcast to their friends and fans using the Web, RSS, or instant messages. Download Bulk downloads not yet available.