Cicero's web -- The ancient foundations of social media: why humans are wired for sharing -- The Roman media: the first social-media ecosystem -- How Luther went viral: the role of social media in revolutions (1) -- Poetry in motion: social media for self-expression and self-promotion -- Let truth and falsehood grapple: the challenges of regulating social media -- And so to the coffeehouse: how social media promotes innovation -- The liberty of printing: the role of social media in revolutions (2) -- The sentinel of the people: tyranny, optimism, and social media -- The rise of mass media: the centralization begins -- The opposite of social media: media in the broadcast era -- The rebirth of social media: from ARPANET to Facebook -- Epilogue: History retweets itself.
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