Identi.ca is a microblogging service. Users post short (140character) notices which are broadcast to their friends and fans usingthe Web, RSS, or instant messages.
If you’d like to try it out, first register a new account.Then, on the public timeline, enter your message intothe textbox at the top of the page, and click “Send”. It will go out on thepublic timeline and to anyone who is subscribed to your notices (probably nobody,at first).
Hey, there’s an even more open competitor to Twitter!