Well, Jody, we found this article that explains it. It’s not really a “phone”. It’s not really an “os”. It’s not even really an “app”. It is more of a homepage to your phone. Right now when you unlock your phone, you are faced with maybe a clock, a widget, some apps, maybe all on wallpaper. With Facebook Home, you will see a Facebook interface with your friend feeds, some photos, or chat bubbles. Facebook Home replaces the lock screen and homescreen of your phone.
Facebook Home becomes available as a download through Google’s Play Store April 12. As of now, Facebook Home is exclusively for Android users. Sorry Windows and iOS users.