Introduction: 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.
