Facebook for Windows Phone v5 has been completely overhauled, with faster performance,a new user interface,improved navigation,support for multiple resolutions and tile sizes and more.
A cleaner flatter user interface look now updated to Facebook app for windows phone which now looks even more cooler.
• See what friends are up to • Share updates, photos and videos • Get notified when friends like and comment on your posts • Chat and have group conversations • Faster and more reliable notifications • Toasts for Facebook chat • Redesigned primary tile • Redesigned secondary tiles for chat, events, groups, pages,
and photo albums • Messaging improvements • Performance improvements • Support for additional languages • Updated design • Improved performance • Video upload • Messenger support • Post detail page
Source: - Facebook app