Jack Dorsey, Noah Glass, Biz Stone, and Evan Williams collectively created Twitter, which is a social networking and microblogging service used by millions of people around the world to share their thoughts, ideas, and news. Twitter was launched in 2006 and has since grown to become one of the most popular social media platforms. It allows users to post short messages, called "tweets," that can contain text, links, images, and videos. The platform has been used for various purposes, including personal communication, political activism, marketing, customer support, and breaking news coverage.