I believe it depends on what sort of report or fake news. I don't think FB will care to monitor everything, it's a waste of money. Furthermore, FB won't know who to believe too.
please don't make useless comment or lies against me by using an "if", when did I say I am not happy with FB? Even "if" I am not happy, why should I delete my account? Of course I spend more time elsewhere, life is not just FB.