My code is alpha so use at your own risk.

FIRST THING!
sh install.sh
This automagically installs dependencies and compiles sqlite bindings

To run the webserver:
node server.js
connect to http://localhost:8080/tweets

Example servers are running (may be up or down depending...)
http://www.nostat.us:8080/tweets
http://cowboy.asia:8080/tweets

If you enter a message in the box and press 'send', it will send your message to every other server on the entire network.

To send a message to all webservers from command line:
node client.js "Some interesting message"

The messages from client.js will propagate to every webserver in the network.
It's routed using the Telehash distributed p2p network http://www.telehash.org

I also included a php client:
php client.php "Some interesting message"

Released under MIT
Copyright Tyler Gillies 2011