Disable OTA upgrades/updates. Every time you update/upgrade the firmware you change the playing field. Upgrades can and do break Samsung's. At the best it will mean more work for you, at the worst a lose of functionality or usability.There are a few components for Facebook that you need to remove. Basically, remove any app with Facebook in the file name. Usually there are 3 or 4. Major updates can reinstall apps. Just remove them again.