After facing ire over reports that its moderators protect far-right activists and under-age accounts, Facebook says it is constantly grooming over 7,500 content reviewers how to handle posts related to hate speeches , terror and child sexual exploitation on its platform. The content reviewers are a mix of full-time employees, contractors and companies Facebook partners with — covering every time zone and over 50 languages across the world. “Content review at this size has never been done before. After all, there has never been a platform where so many people communicate in so many different languages across so many different countries and cultures. We recognise the enormity of this challenge and the responsibility we have to get it right,” Ellen Silver, Vice President of Operations at Facebook , wrote in a blog post on Friday. “Language proficiency is key and it lets us review content around the clock. If something is reported in a language that we don’t support 24/7, we