Maki

Facebook and Messenger work in the same place on desktops, but on mobile platforms, users need to install two different applications. Maki aims to correct this problem by providing a single app that can do both, at the same time.
 
Maki comes with support for the Facebook home feed, audio calls, chat, and customizations, all in one package. Furthermore, it’s possible to restrict the usage for selected time intervals, and even to block it at certain hours.
 
To make things even better, there are no ads from the developers of the app, and they are also promising that they are not collecting personal data.