If you are using Pidgin and you have Facebook account, then you can chat with your friends without having to open up Facebook site. All you need is pidgin-facebookchat made by Eion Robb and many other contributors which will integrate as plugins for Pidgin and enables you to have a chat with your friends that logged in Facebook.
The installation is very straightforward. All you need is to download and extract the archive and put the appropriate .so files into Pidgin's plugin directory. It's all mentioned at the document. Next create a new account using Facebook type and voila... you are now connected to FB via Pidgin. You can set your status also via Pidgin. It's a nice plugin for Pidgin.