https://arstechnica.com/tech-policy/2021/10/facebook-is-tearing-our-societies-apart-whistleblower-says-in-interview/

The Facebook whistleblower revealed her identity last night along with her plans to reform the embattled social media company from the outside. Frances Haugen, a data scientist by training and a veteran of Google and Pinterest, had been recruited to Facebook in 2018 to help the platform prepare for election interference. When she quit in May, she took with her a cache of tens of thousands of documents that now underpin a sweeping congressional investigation into Facebook's practices.

But Haugen's turning point came months earlier, on December 2, 2020, less than a month after the presidential election, when the company disbanded the Civic Integrity team she worked on.