COLUMBUS, Ohio - The reports of hateful and violent posts on Facebook started pouring in on the night of May 28 last year, soon after then-President Donald Trump sent a warning on social media that looters in Minneapolis would be shot.It had been three days since Minneapolis police officer Derek Chauvin kneeled on the neck of George Floyd for more than eight minutes until the 46-year-old Black man lost consciousness, showing no signs of life.