Meta and TikTok let harmful content rise after evidence outrage drove engagement, say whistleblowers

Social media giants made decisions which allowed more harmful content on people's feeds, after internal research into their algorithms showed how outrage fuelled engagement, whistleblowers told the BBC. More than a dozen whistleblowers and insiders have laid bare how the companies took risks with safety on issues including violence, sexual blackmail and terrorism as they battled for users' attention.