In their new book, 'New York Times' reporters Cecilia Kang and Sheera Frenkel examine the problems Facebook created and the problems it's facing. We talk about disinformation, hate speech, and how CEO Mark Zuckerberg knew the "Stop the Steal" private groups were planning a riot on the capitol but decided against warning the president. "Facebook knew the potential for explosive violence was very real [on Jan 6]," Kang says.