From the founder of Wikipedia, a sweeping reflection on the global crisis of credibility and knowledge, revealing “the rules of trust” that transformed Wikipedia from a scrappy experiment into a global utility used by billions of people—and how those rules can help others build things that lastFrom the beginning, people predicted Wikipedia’s demise. Instead, this global experiment in sharing knowledge and expertise online has become part of the fabric of modern, connected life. Today, every month, people view Wikipedia 11 billion times—just in the English language. The Internet’s encyclopedia has become a global utility, like water or electricity, and we rarely pause to consider the extraordinary fact of its existence.Long before it became the biggest collection of knowledge in the history of the world, Wikipedia had to overcome its greatest challenge: getting strangers on the Internet to trust each other. They had to trust that others would not be abusive or uncivil. They had to trust