Facebook Falls After Whistleblower Speaks Out Against Harms

Facebook Inc. shares dropped to their lowest level since June on Monday after a whistleblower revealed herself for the first time and accused the social media giant of putting “profit over safety” of its users.

“There were conflicts of interest between what was good for the public and what was good for Facebook,” Frances Haugen told the news program “60 Minutes” on Sunday evening. “Facebook over and over again chose to optimize for its own interests like making more money.”

Haugen, who helped tackle misinformation on the platform, has turned over thousands of pages of Facebook’s internal research to U.S. ...