Facebook Home now offers Instagram, Flickr, Pinterest and Tumblr right on the lock screen
This is an extremely easy process and you once you're finished, you will be able to like and comment on those four sites directly from your Facebook Home lock screen. Or, you can decide to click on a button and get sent to any of the four individual web sites.
While only those Beta testing Facebook for Android can sign up now for the special lock screen content, keep in mind that eventually all Facebook Home users will get to add this feature to the app.
source: Facebook via Engadget