In early 1999 Searls joined Christopher Locke, David Weinberger and Rick Levine in writing "The Cluetrain Manifesto," an iconoclastic website that was followed in January 2000 by the book with the same title. The book was published in nine languages. A 10th Anniversary edition came out in June 2009. Among Searls' contributions to the Manifesto was its first thesis, "Markets are conversations"—also the title of the "Cluetrain" chapter he co-wrote with David Weinberger. Weinberger and Searls co-wrote "World of Ends: What the Internet Is and How to Stop Mistaking It for Something Else".