Gwibber can post and receive messages from multiple social networking services, including Twitter, the open source Twitter variant, Identi.ca, Laconi.ca, Digg, Pidgin, Facebook, Flickr, Ping.fm, Jaiku and RSS/Atom feeds.
It comes packaged for a number of distributions, including Ubuntu, openSUSE and Fedora. While Gwibber doesn't yet deliver every last feature that every social network it connects to provides, it's a great way to keep up with reading and posting across networks with relatively little effort.
Jaunty Jackalope (Ubuntu) already got gwibber in the repositories and can be installed with a simple command: $sudo apt-get install gwibber
OpenSuse 11.1 user can use "1-click" installer to install gwibber
After successful installation of gwibber, go to terminal (GNOME) and type command: gwibber to start the application
Gwibber's account set up and management is straightforward. Gwibber comes with a few default themes that feature some individual customization options (different social networks can be assigned different colored banners for their updates), and while additional themes are available, they're not located in one central repository.