So what is the solution in your opinion?

Do we take Facebook away? The same problem will appear again in the next big social media network.

I do not know why people try going after facebook with pitchforks, when it is very much a people problem. One way to solve this would be to take anonymity of the internet away completely, but then people would

Facebook is just a platform, it isn't like there are a bunch of evil people sitting on a computer finding the most vile pieces of content and showing it to you.

It is what people seek, facebook just facilitates it. I am sure if google was to do similar studies on what people search for and how it affects them, it will see similar results.