New Yorker staff writer Andrew Marantz embedded with extremist "gate-crashers" teeming on social media platforms and the lax "gate-keepers" in Silicon Valley for his new book titled "Antisocial: Online Extremists, Techno-Utopians, and the Hijacking of the American Conversation." In order to take the conversation back, Marantz tells Brian Stelter, "the only way forward is to really really look this stuff in the face." He also talks about the Overton Window, media manipulation, the "alt right," and the rise of white supremacist rhetoric on the internet.To learn more about how CNN protects listener privacy, visit cnn.com/privacy

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