In technical circles, "4.4.2" sometimes refers to the , a tool developers use to integrate Facebook logins and sharing into mobile apps. This version was popular for building hybrid apps around 2018–2019.
The standard Facebook app now generally requires Android 6.0 or higher to run the latest features. Core Features of Legacy Version 4.4.2 facebook 4.4.2
Facebook 293.0.0.43.120 (arm-v7a) (nodpi) (Android 4.4+) - APKMirror In technical circles, "4