Papyrus rolls and Twitter have much in common: They were their generation's signature means of "instant" communication. Indeed, as Tom Standage reveals in his scintillating new book, social media is anything but a new phenomenon. From the papyrus letters that Cicero and other Roman statesmen used to exchange news across the Empire to the rise of hand-printed tracts of the Reformation to the pamphlets that spread propaganda during the American and French revolutions, Standage chronicles the increasingly sophisticated ways people shared information with each other, spontaneously and organically, down the centuries. With the rise of newspapers in the nineteenth century, the nature of communication changed; increasingly, especially as radio and television, the "mass media," came to dominate in the twentieth century, information was centrally controlled. However, with the advent of the Internet, the story has come full circle, and the spreading of information along social networks has reemerged in powerful new ways. A fresh, provocative exploration of social media over two millennia, Writing on the Wall constantly reminds us how modern behavior echoes that of prior centuries -- the Catholic Church, for example, faced similar dilemmas in deciding whether or how to respond to Martin Luther's attacks in the early sixteenth century to those that large institutions confront today in responding to public criticism on the Internet. Invoking the likes of Thomas Paine, the celebrated Madame Doublet in the French Revolution, and Vinton Cerf, co-inventor of the Internet, Standage explores themes that have long been debated: the tension between freedom of expression and censorship; whether social media trivializes, coarsens or enhances public discourse; and its role in spurring innovation, enabling self-promotion, and fomenting revolution. As engaging as it is visionary, Writing on the Wall draws on history to cast new light on today's social media and encourages debate and discussion about how we'll communicate in the future. - Publisher.