Running the full-scale Facebook app on Android 4.4.2 eventually exposed major technical limitations as the platform updated its server-side architecture.
Over weeks of use, the app cache would swell from a 40MB installation file to hundreds of megabytes of temporary data, choking the limited 4GB or 8GB internal storage common on KitKat-era phones. The Rise of Facebook Lite
Android 4.4.2 has not received official security patches from Google in years, leaving it vulnerable to exploits. Facebook For Android 4.4.2
Clear old system cache to free up maximum RAM and storage.
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The root security certificates packaged inside Android KitKat have largely expired, causing secure connection errors across the web. How to Access Facebook on Android 4.4.2 Today
Navigating Facebook for Android 4.4.2: Solutions, Performance, and Alternatives Clear old system cache to free up maximum RAM and storage
Do not download APKs from random pop-up ads. Stick to reputable archives:
Settings > Apps > Facebook > Storage > Clear Cache (NOT Clear Data). Do this once a week to prevent the app from grinding to a halt.