On Instagram, a detail from a medieval painting was superimposed with words suggesting Jews were responsible for the deaths of children.
On Twitter, a photoshopped image of world leaders with the Star of David on their foreheads was posted above the hashtag #JewWorldOrder.
And on YouTube, a video of the World Trade Center on fire was used as a backdrop for an argument that Jews were responsible for the terrorist attacks on the towers 20 years ago.
All are examples of anti-Semitic content explicitly banned by social media companies. They were shared on social media and were allowed to remain up even after they were reported to social media companies, according to a report released on Friday by the Center for Countering Digital Hate, a…