Facebook has introduced “Facebook Home” for your Android phones. It is simply an application to be installed on certain phones like HTC One X, HTC One X+, Samsung Galaxy S III and Samsung Galaxy Note II. It’s also pre-installed in HTC First.
Once installed, the home screen of your phone is the Facebook Home where you can read the messages of your contacts and other notifications. You can also continue chatting while using other apps on the phone.
See here for more. Facebook Home shall be available for download from Google Play on April 12, 2013 or get it first with HTC First device.