To get Home working on these handsets, you'll need to also be running the most recent versions of Facebook's standard Android mobile application and Facebook Messenger for Android.
Facebook Home is either just the right amount of Facebook or, depending on your social-networking preferences.
In my, Facebook has done a marvelous job of transforming your home screen with Cover Feed, a visually arresting slideshow that pares down News Feed to just photos and "likes." The Home software, however, forces you to split your attention between Facebook and Google, and will likely never appeal to those who with access to their smartphones.
Update, 1:50 p.m. PT: Early reviews from downloaders are rather abysmal. So far, more than 700 reviewers have given Facebook Home an average of 2.3 stars out of five.