Gyachi is Simple program Yahoo! Client for Linux Operation System,, This Yahoo! client for Linux operating system supports almost all of the features you would expect to find on the official Windows Yahoo! client: Voice chat, webcams, faders, 'nicknames', audibles, avatars, display images, and more.
Yet, it remains very light-weight and memory-friendly.
GyachE Improved uses Gtk-2 for its user interfaces (Gtk-2 2.0.6 or better required). and the best from gyachi,, we can see buddy's invisible or buddy's really off....
How to install ?
just copy paste this to u'r console...
sudo add-apt-repository ppa:adilson/experimental
sudo apt-get update
sudo apt-get install gyachi
Good Luck !!!