Features: Facebook Chat, Status Feed, Notifications & New Messages Indicators, Picture & Video Uploads Directly From Your Phone, Integrated m.facebook.com Browser, All Display Resolutions, Touch Friendly, No 3rd Party Registration, AppToDate Support
Download from here the mobile installer (.cab file) to your desktop. Sync with your mobile phone and copy the .cab installer to your phone. From your phone go to Programs -> File Explorer, navigate to the .cab file and select it. The Installer should do the rest, or navigate to http://get.mosko.mobi on your Windows Phone, choose open, the installer should do the rest.