If you’re using Facebook, you’ve probably already tried out its chat functionality. Yet another browser-based chat, only available when on Facebook, right? Except there’s this great plugin for the open source, cross-platform, multi-protocol IM-client that is Pidgin. Just add Pidgin-facebookchat to your plugins and you can chat with Facebook-friends the same way you chat with all your Google Talk-, MSN- or AIM-buddies. Nice work guys!
And for the Twitter-loving Pidgin-users; maybe this Twitter-plugin works for you?