The popular and controversial English-language imageboard 4chan is launched.

An imageboard is a type of Internet forum that focuses on the posting of images, often alongside text and discussion. The first imageboards were created in Japan as an extension of the textboard concept. These sites later inspired the creation of a number of English-language imageboards.

4chan is an anonymous English-language imageboard website. Launched by Christopher "moot" Poole in October 2003, the site hosts boards dedicated to a wide variety of topics, from video games and television to literature, cooking, weapons, music, history, technology, anime, physical fitness, politics, and sports, among others. Registration is not available, except for staff, and users typically post anonymously. As of 2022, 4chan receives more than 22 million unique monthly visitors, of whom approximately half are from the United States.

October 1 is the 274th day of the year in the Gregorian calendar; 91 days remain until the end of the year.