This is the full-featured app. However, on Android 5.1 devices—which often have limited RAM and older processors —the standard app may cause significant lag, crashes, or battery drain.
Before you download a file, you need to decide which version of the app will run best on your device: apk facebook android 5.1
Ensure your Date and Time settings are set to "Automatic." If the system clock is wrong, Facebook's security certificates will fail. This is the full-featured app