First thing I do when I upgrade my LG phone (I've had the LG G2, LG G5, and now the LG G7, I don't think it was preinstalled in the G2 but I can't be certain) is to disable Facebook and related uninstallable apps. If I bothered to root my phone I'd remove them as well. It's obnoxious that phone manufacturers include more than just vanilla Android, which is why I will likely get Nokia or Motorola for my next phone, they're usually unlocked and not riddled with crapware, funny how much cheaper they are too...