Jack Dorsey chose Square over Twitter

Jack Dorsey, the co-founder of Twitter, is stepping down as CEO of the social media company after six years. In his resignation letter, posted on Twitter, Dorsey said he wants the company to break away from the vision and control of its co-founders, calling founder-led companies “severely limiting.” Dorsey was the first CEO of Twitter from 2006 to 2008 and returned in 2015 after a period away from the day-to-day management of the company.