The whistleblower who plunged Facebook into crisis

After a set of leaks last month that represented the most damaging insight into Facebook’s inner workings in the company’s history, the former employee behind them has come forward. Now Frances Haugen has given evidence to the US Congress – and been praised by senators as a ‘21st century American hero’. Will her testimony accelerate efforts to bring the social media giant to heel?. Help support our independent journalism at theguardian.com/infocus