Since you cannot find these versions on the Google Play Store, you must use a third-party source.

Open Google Play Store, go to Facebook settings, and uncheck "Auto-update" to prevent the app from updating to an incompatible version. Known Limitations

KitKat, released in 2013, was built in a different era. According to data from early 2025, KitKat runs on a mere . This tiny fraction means developers see little incentive to spend resources ensuring their newest versions work on the OS version. The end result is a version lockout: you see an "incompatible device" message in the Google Play Store for the main Facebook app. This might sound like a dead end, but a very specific and well-suited solution exists.