Hellotxt

This is how Hellotxt describe themselves .

HelloTxt is an aggregate of microblogging services
through which the user can insert their messages on all main
microblogging services in a simply and simultaneous way.

http://www.hellotxt.com/

In my own words put it simpy one post updates,twitter jaiku,facebook,myspace and Bebo . Its webbased they have a mobile version and of course a facebook app.