https://www.theguardian.com/technology/video/2021/oct/25/facebook-unquestionably-exacerbating-hate-whistleblower-tells-mps-video

Much of the blame for the world's increasingly polarised politics lies with social networks and the radicalising effects of their services, the whistleblower Frances Haugen told MPs as she called for external regulation to reduce social harm. The company’s internal culture prioritised profitability over its impact on the wider world, said Haugen, a former product manager on Facebook's civic misinformation team