An example post on was where someone was complaining about a strange black man walking through their neighborhood.
Of course when you read the post carefully you would then come to realize, that this man was walking down the sidewalk, during the day, not bothering or talking to anyone, just minding his own business.
The reality is there was nothing particularly strange about this black man. Nothing in her description explains what he did that made him strange. She likely just finds it strange that a black man is walking through their neighborhood.
The other thing is these kinds of posts would always be followed up with someone along the lines of "keep an eye out for him" or "don't let him near your kids" or "call the police if you see him again" or that kind of fear-mongering nonsense.
I was honestly downright surprised how racist some of these people are.