Currently the plugin can log into the Facebook servers, grab the buddy list, send/receive messages, add/remove friends, receive notifications, search for Facebook friends and set your Facebook status.
Note:- Now this plugin is in ubuntu repositories use the following command to install
sudo apt-get install pidgin-facebookchat
Install Facebook Chat for Pidgin in Ubuntu
First you need to download the plugin using the following command
Now you should have pidgin-facebookchat-1.38.deb package.Install this .deb package using the following command
sudo dpkg -i pidgin-facebookchat-1.38.deb
This will complete the installation.After installation you need to restart Pidgin! You will then have a FacebookChat option in your accounts manager dialog.