Facebook changed its general user interface for windows phone 8 with some new feature, which is really better then previous.
They enlarge the news feed,with high resolution picture. It added three shortcuts for posting new status, posting a photo and checking in.
You can see your online friend through this updated app, which was missing in previous version.
You can get your pages, group etc. in one place.
You will feel like your PC’s Facebook environment. Windows has updated this only for Windows Phone 8 interface and not for Windows Phone 7 and Windows Phone 7.5.
For manual update go to store and find the Facebook app and start updating. Or you can download the XAP file from the Windows Store.
To know how to install XAP file you can visit How to install XAP.
So, start facebooking and be social