A visionary and optimistic thinker examines the tension between privacy and publicness that is transforming how we form communities, create identities, do business, and live our lives. The internet, Jarvis argues, will change business, society, and life as profoundly as Gutenberg's invention, shifting power from old institutions to us all. Based on extensive interviews, Public Parts introduces us to the men and women building a new industry based on sharing. Some of them have become household names—Facebook's Mark Zuckerberg, Google's Eric Schmidt, and Twitter's Evan Williams. Others may soon be recognized as the industrialists, philosophers, and designers of our future. Jarvis explores the promising ways in which the internet and publicness allow us to collaborate, think, ways—how we manufacture and market, buy and sell, organize and govern, teach and learn. He also examines the necessity as well as the limits of privacy in an effort to understand and thus protect it. This new and open era has already profoundly disrupted economies, industries, laws, ethics, childhood, and many other facets of our daily lives. But the change has just begun. The shape of the future is not assured. The amazing new tools of publicness can be used to good ends and bad. The choices—and the responsibilities—lie with us. Jarvis makes an urgent case that the future of the internet—what one technologist calls "the eighth continent"—requires as much protection as the physical space we share, the air we breathe, and the rights we afford one another. It is a space of the public, for the public, and by the public. It needs protection and respect from all of us. Jeff Jarvis blogs about media, news, technology, and business at Buzzmachine.com, and appears weekly as a co-host on Leo Laporte's "This Week in Google." He is associate professor and director of the Tow-Knight Center for Entrepreneurial Journalism at the City University of New York's Graduate School of Journalism. The author of What Would Google Do?, he lives in the New York area. Join the conversation at buzzmachine.com/publicparts and on Twitter (@jeffjarvis and #publicparts).