This book examines the history and future of Section 230 of the Communications Decency Act, a 1996 law that provides websites extraordinary legal immunity for user-generated content and is responsible for the modern Internet in the United States. Section 230 has created America’s trillion-dollar online industry, and protects online speech to an unprecedented degree. Through interviews, reviews of thousands of court documents, and legal analysis, Professor Jeff Kosseff examines how Congress quietly passed this law, how it has shaped the Internet, and the costs and benefits of protecting online platforms.