You may or may not know that Facebook has several keyboard shortcuts you can use to quickly navigate around the site without using a mouse.
The first part of the shortcut varies depending on what browser you're using. Here's a list of each:
Windows + Chrome = Alt
Windows + Firefox = Alt + Shift
OS X + Firefox = Function + Ctrl
OS X + Other Browser = Ctrl + Option
Now that you know what facebook shortcuts you can use with your browser, take a look at this video from Tekzilla to find out what other interesting things you can use with Facebook.