Turns out to be that the build itself is pulled out from a ROM of a HTC First and is almost close to a final version – just less optimized.
The pre-requisites to installing Facebook Home is having a device with a maximum resolution of 1280*768. One must start fresh by completely un-installing the Facebook app. which is already installed. This wouldn’t be a problem with Nexus users , while other users need to root their device to remove the integration of the ROM.
The leak itself is 3 APKs – the main Facebook app (‘katana’), the now-integrated-with-your-SMS Messenger app (orca) and the Home / Launcher ‘shell’ app (home). Simply install all 3 and you’re set – bear in mind you do so at your own risk!