You are downloading the Facebook XAP file v220.127.116.11 for Windows Phone. Facebook is a free and useful Social app: Keeping up with friends is faster than ever. See what friends are up to, share updates, photos, and videos, and get notified when friends like and ... You can now download the offline XAP file to install & try it.
Download Locations for Facebook 18.104.22.168 XAP file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline Facebook XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.