The whistleblower who plunged Facebook into crisis

After a series 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. Frances Haugen has given evidence to the US Congress – and been praised by senators as a ‘21st century American hero’. In this episode, Nosheen Iqbal talks to the Guardian’s global technology editor Dan Milmo about what we learned from Haugen’s testimony, and how damaging it could be for Facebook