Incident 197: Facebook Internally Reported Failure of Ranking Algorithm, Exposing Harmful Content to Viewers over Months

Description: Facebook's internal report showed an at-least six-month long alleged software bug that caused moderator-flagged posts and other harmful content to evade down-ranking filters, leading to surges of misinformation on users' News Feed.


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Alleged: Facebook developed and deployed an AI system, which harmed Facebook users.

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Sean McGregor, Khoa Lam

Incident Reports


A "variant" is an incident that shares the same causative factors, produces similar harms, and involves the same intelligent systems as a known AI incident. Rather than index variants as entirely separate incidents, we list variations of incidents under the first similar incident submitted to the database. Unlike other submission types to the incident database, variants are not required to have reporting in evidence external to the Incident Database. Learn more from the research paper.