Includes bibliographical references and index

Contents: The Ancient Foundations of Social Media: Why humans are Wired of 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