For Android, Facebook released a messaging application updates it on 20 September.
Quoted from TechRadar, Monday (01/10/2012), the most important change in this update is a feature that allows users of the iPhone, iPad and iPod touch to rub into the left side in order to see contacts are online and available.
Other existing updates allows users to save favorite fella at the top of the list online. This method minimizes the need for scrolling through the list of contacts.
Incoming messages are now displayed as a bubble conversation similar to the messages application on iOS, making it look more attractive. In addition, the new version of messaging applications have been optimized for the large screen of the iPhone 5, as well as an increase in the speed and bug fixes.