Android already offers lock screen widgets, so it's possible FB Home will include something to that effect that would show even while the phone is locked.
It would be entirely optional to use that widget, however, unless FB Home is able to replace the lock screen itself. As far as I know, that can't be done without rooting the device.
It would be entirely optional to use that widget, however, unless FB Home is able to replace the lock screen itself. As far as I know, that can't be done without rooting the device.