Humans are filtering the web's darkest content, but what effect is it having on the content moderators and can AI ever take over the job? Dhruti Shah is a journalist who moderated content for the BBC and paid a high price for it, she shares her story. Plus, the investigative journalist Eliot Higgins explains how his company Bellingcat uses social media and internet content to find evidence of war crimes. He says automated moderators on popular social media sites are unwittingly destroying vital evidence. And finally, we hear from Sarah Roberts - Assistant Professor in the Department of Information Studies at UCLA - a leading expert in the practice of commercial content moderation. (Picture: Hand and Laptop, Credit: Getty Images)