Facebook Home has been out for a while now but is still only available for a few devices. There are a few ways to get around that, but the methods can be a bit complicated. Developer "ruqqq" has put together a mod that works alongside Xposed framework to make things much easier. This method doesn't require your apks to be resigned meaning that you can update your Facebook Home when every time the app is updated. The HTC First was the first to feature the home screen replacement and is nearly free now, so it is questionable how many of you would be interested in this. However for the few of you that are Facebook fanatics this makes everything nice and simple. You can grab the downloads and all the info at the source link below.
Via XDA
Via XDA