It's pretty clear from the website and the coverage that it does replace the lock screen itself: https://www.facebook.com/home https://www.facebook.com/home No

It's pretty clear from the website and the coverage that it does replace the lock screen itself: https://www.facebook.com/home https://www.facebook.com/home Now, whether or not it replaces the lock screen when it has a passcode/security, is a different story. But, by default, your FB info is available just by tapping the unlock button/home button BUT BEFORE you unlock.