Google and Meta (Facebook) have long since dropped support for Android 4.1.2.
The solution is to install an of an older, optimized version of the app manually.
The app allowed for writing on timelines, liking photos, and managing groups, which were the "desktop-class" features users craved on the go. The Modern Challenge
Some features like profile bios or interactive buttons may not function correctly on these older builds. 3. Step-by-Step Installation Guide