> post-traumatic stress disorder caused by exposure to graphic social media content including murders, suicides, child sexual abuse and terrorism.
If you want a taste of the legal portion of theses just got to 4chan.org/gif/catalog and look for a "rekt", "war", "gore", or "women hate" thread. Watch every video there for 8-10 hours a day.
Now remember this is the legal portion of the content moderated as 4chan does a good job these days of removing illegal content mentioned in that list above. So all these examples will be a milder sample of what moderators deal with.
And do remember to browse for 8-10 hours a day.
edit: it should go without saying that the content there is deep in the NSFW territory, and if you haven't already stumbled upon that content, I do not recommend browsing "out of curiosity".