Using a Facebook APK file for Android 4.4.2 requires trust. Because official support is dead, you are responsible for your data security. Follow these rules:
An APK (Android Package Kit) is the raw installation file. By downloading a legacy Facebook APK built specifically for API Level 19 (Android 4.4.2), you bypass the Play Store’s compatibility check. The last stable version that supports KitKat is Facebook v327.0.0.25.115 (released early 2021). Facebook Apk File For Android 4.4.2
Even with the perfect APK, you will encounter problems. Here are the top 5 issues on KitKat: Using a Facebook APK file for Android 4