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91̽»¨ history professor Margaret O’Mara says Elon Musk’s acquisition of Twitter has renewed debate about freedom of online speech, online content moderation and the power of billionaires to shape public conversation.

Her sweeping new book about the history of Silicon Valley has 91̽»¨history professor Margaret O’Mara on a busy national book tour this summer. The book, “The Code: Silicon Valley and the Remaking of America,” was published this month by Penguin Press and is receiving many positive reviews.

Margaret O’Mara, 91̽»¨professor of history, explores the impact of a December 1968 computer presentation that came to be called “the mother of all demos” in an essay and podcast from the news website The Conversation.