Jack Dorsey has stepped down from Twitter, the social media platform he co-founded with Evan Williams and Christopher Stone in 2006. Born November 19, 1976, in St. Louis, Missouri, the American tech tycoon and philanthropist became interested in dispatch routing as a teenager; a taxi-dispatching software he created was adopted by taxicab companies. Dorsey enrolled at the University of Missouri–Rolla in 1995 before transferring to New York University in 1997. He dropped out two years later, a semester before graduating.

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Dorsey moved to San Francisco, California, where he set up a company that used the Internet to handle the dispatching of couriers and emergency vehicles as well as taxis. Dorsey has said he first considered using text and instant messaging (based on the principles of dispatch software) as a way of keeping in touch with friends in 2000. Six years later, he approached Williams and Stone with his idea. The trio developed a prototype of what would become Twitter.

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Dorsey posted the first Twitter message on March 21, 2006, which read “just setting up my twttr”. The platform allowed users to send messages no longer than 140 characters, and quickly became a popular social networking hub.

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Dorsey served as CEO until October 2008, when he became chairman of the board, overseeing Twitter’s initial public offering (IP)) in 2013, which raised $1.8 billion.

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In 2009, Dorsey co-founded and became CEO of Square, a mobile-payments venture that offered devices and software to facilitate credit-card transactions.

Square had more than two million users by 2012, within just two years of its launch. Dorsey became a member of Disney Company’s board of directors in 2013. In October 2015 he once again became CEO at Twitter while also remaining as Square’s CEO.