In August 2018, a Reuters investigation found that Facebook did not adequately moderate both hate speech and calls for genocide of the Rohingya minority Muslim group in Myanmar. According to the Human Rights Watch, nearly 700,000 Rohingya refugees have fled the Rakhine State of Burma because of a military-led ethnic cleansing campaign since August 2017.
ProPublica has called Facebook's enforcement of hate speech rules "uneven," explaining that "its content reviewers often make different calls on items with similar content, and don't always abide by the company's complex guidelines."
Facebook's use of human content moderators came under scrutiny in June when The Verge reported that Keith Utley — a 42-year-old employee at a Facebook moderation office operated by Cognizant in Tampa, Florida — died of a heart attack on the job a year prior.
The Verge also reported the job site was home to poor working conditions, where content moderators are tasked with watching hours of graphic footage that had been posted on Facebook in an effort to keep the content clean of anything that violates its terms of service.
Fast Company reported five days after the Verge piece that Facebook was expanding its tools for content moderators, with the goal of buffering the negative psychological effects of consuming disturbing Facebook posts, and that these tools were underway before the Verge story.
Sources: ProPublica, Reuters, Fast Company, Business Insider, The Verge