You are downloading the Fast - Social App XAP file v18.104.22.168 for Windows Phone. Fast - Social App is a free and useful Social app: Fast is an alternative and free client to manage your Facebook account! Fast gives a great and full experience even to the less powerful device! ... You can now download the offline XAP file to install & try it.
Download Locations for Fast - Social App 22.214.171.124 XAP file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline Fast - Social App XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.