: If you are actually trying to run Facebook on an Android 4.1 device, the modern 411 version will not install. You must download a "legacy" APK specifically marked as "Android 4.1+" or use Facebook Lite for better performance on old hardware.
A: If you uninstall the Facebook app, the com.facebook.katana folder will usually be removed. If you keep the app, the folder needs to stay for the app to function. You cannot "move" it to an SD card without rooting the phone, as it is core system data. facebook katana apk android 411