If you have that constant urge to check Facebook after every few minutes, switch to Facebook Desktop and never launch the browser again.
Facebook Desktop is a light-weight client that sits in your system try, like any other messenger software, and will alert you as soon as some new activity happens in your Facebook stream. The alerts are presented as unobtrusive pop-ups on the desktop that automatically fade after some time.
Facebook Desktop is written in Adobe AIR and will work on Windows as well as Mac OS X 10.5. It displays notifications for status updates, new wall posts, friend requests and messages from Facebook friends but nothing related to Pages that you may have liked on Facebook.
I have had it running on my desktop for almost a week now and the alerts from friend’s activity on Facebook almost appear in real-time. There’s also an official client for Facebook they seem to have abandoned it.