If you're not interested in using Facebook's Chat feature, then the list hogging the right-hand side of your screen can be a nuisance. Fortunately, you can disable it with a simple extension.
The FB Chat Sidebar Disabler is available for Chrome, Firefox and Opera. There's not much to it: just install it and you'll no longer have a list of friends popping up at the side of your screen. If you do want to chat, then you can still click the small chat pop-up at the bottom of the screen to see who is currently online — a better option for many of us.