Full story: https://abcnews.go.com/Business/wireStory/kill-facebook-fail...
These were submitted to test Facebook's systems, because there's a good reason not to trust their promises on this front. Facebook was used extensively to propagate hate speech in Myanmar during the crisis of 2017, with their moderation tools and hate speech detection system letting through a ton of hateful content with real-world consequences, in the course of an actual ethnic cleansing campaign.
Other references: "Facebook Admits It Was Used to Incite Violence in Myanmar" https://www.nytimes.com/2018/11/06/technology/myanmar-facebo... (2018)
"Violent hate speech continues to thrive on Facebook in Myanmar, AP report finds" https://www.cbsnews.com/news/myanmar-facebook-violent-hate-s... (9 months ago)