Adapted from “Broken Code: Inside Facebook and the Fight to Expose Its Harmful Secrets" by Jeff Horwitz, to be published on Nov. 14, 2023, by Doubleday, an imprint of the Knopf Doubleday Publishing Group, a division of Penguin Random House LLC. Copyright © 2023 by Jeff Horwitz. Write to Jeff Horwitz at jeff.horwitz@wsj.com
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