Facebook mostly relies on its users to flag content that violates the company’s policies. The famous social media prohibits nudity, terrorism and hate speech on its website, including strict rules around child pornography. Facebook employs a technology called PhotoDNA which scans for images related to child sexual exploitation. PhotoDNA uses a database created by the National Center for Missing and Exploited Children to help reduced the crime on the platform. But Hany Farid, who helped develop the Photo DNA system said the Vietnam image would never have been included in the child pornography database. Farid said the case of the banned picture is an issue of the judgment of what does and does not violate terms of service, and not of the technology that is used to enforce those terms.