Abstract: See only what you want to see, hear only what you want to hear, read only what you want to read. In cyberspace, we already have the ability to filter out everything but what we wish to see, hear, and read. Tomorrow, our power to filter promises to increase exponentially. With the advent of the Daily Me, you see only the sports highlights that concern your teams, read about only the issues that interest you, encounter in the op-ed pages only the opinions with which you agree. In all of the applause for this remarkable ascendance of personalized information, Cass Sunstein asks the questions, Is it good for democracy? Is it healthy for the republic? What does this mean for freedom of speech? Republic.com exposes the drawbacks of egocentric Internet use, while showing us how to approach the Internet as responsible citizens, not just concerned consumers. Democracy, Sunstein maintains, depends on shared experiences and requires citizens to be exposed to topics and ideas that they would not have chosen in advance. Newspapers and broadcasters helped create a shared culture, but as their role diminishes and the customization of our communications universe increases, society is in danger of fragmenting, shared communities in danger of dissolving. In their place will arise only louder and ever more extreme echoes of our own voices, our own opinions. In evaluating the consequences of new communications technologies for democracy and free speech, Sunstein argues the question is not whether to regulate the Net (it's already regulated), but how; proves that freedom of speech is not an absolute; and underscores the enormous potential of the Internet to promote freedom as well as its potential to promote "cybercascades" of like-minded opinions that foster and enflame hate groups. The book ends by suggesting a range of potential reforms to correct current misconceptions and to improve deliberative democracy and the health of the American republic.