Facebook Home has expanded outside of the US finally, jumping over to the UK and Canada for starters. Even if you're based in the UK or Canada, you'll still need a specific phone for Facebook Home to work.
These phones are the Samsung Galaxy Note II, Galaxy S III, HTC One X+, One X or One. Facebook Home does come pre-installed on one phone at the momnet, the HTC First, which is still a US-exclusive on AT&T. EE and Orange have confirmed they'll support HTC's First smartphone in the UK, but there's no word right now on any Canadian telcos carrying the 'Facebook phone'.
So if you're after Facebook Home for your smartphone, and have a compatible device, check out the Google Play Store on your device.