Facebook Home, announced last week, is planning to take the Play Store by storm. It offers a full launcher and lockscreen replacement for Facebook users, having photos and statuses where you can easily see them. Your background for the lockscreen will be your social feed, and your app drawer will have shortcuts to post to Facebook.
It also includes Chat Heads, something also included in the latest Facebook Messenger update. Unfortunately, it’s currently only compatible with six phones, four if you don’t count unreleased ones (at least in the US). You can use it on the HTC One X, HTC One X+, HTC One, Samsung Galaxy S III, Samsung Galaxy Note II, and Samsung Galaxy S 4. But if you have one of these devices, hit the source link to get started! The link only works for some as the app slowly goes up, so give it some time.