If you are a heavy Facebook user and your platform of choice is Windows Phone 8 you have probably checked out the Beta Facebook application which was available over the past couple of months. Now Facebook for Windows Phone 8 has been updated with a final version of the Beta as it becomes Gold.
Facebook 5.0 is a completely new application. Among others, it brings “a complete overhaul of the user interface, improved navigation, support for high-res pictures, post sharing, and Facebook Timeline view”. If you want to stay up to date with every minor (or major) change, you can still use the beta to get improvements before they’re rolled out to the official application (which can be grabbed from the source link below).