Do not download APK files from unverified blogs or random file-sharing links, as they may contain malware. Stick to reputable, historical APK archiving sites that manually verify cryptographic signatures: Step-by-Step Installation Guide
If the app installs but fails to load content, the underlying encryption protocols (TLS) on Android 4.1.2 may be rejected by Facebook’s modern servers. Out of Memory Errors facebook apk android 412
You will need to search for older versions of the main Facebook app. Versions ranging roughly from are generally the last builds to maintain native support for Jelly Bean API level 16. Option 2: Facebook Lite APK (Recommended) Do not download APK files from unverified blogs
Whenever possible, consider upgrading to a newer device to protect your personal data and access the latest app features securely. Versions ranging roughly from are generally the last
You can "Add to Home Screen" from your browser settings to create a shortcut that acts like an app icon. How to Install an APK on Android 4.1.2 What operating systems are supported by the Facebook app?
If your device lacks the RAM to handle any APK, the most stable method is using a mobile browser like Chrome or Opera Mini.