Jack Dorsey goes Square—leaving Twitter at a time of his choosing

“THE COMPANY is ready to move on from its founders,” explained Jack Dorsey, chief executive of Twitter, a distributor of short messages, as he announced on November 29th that he would step down and hand the reins to the firm’s chief technology officer, Parag Agrawal. “About time,” was the grumpy reaction of more than one stockmarket analyst, many of whom had long criticised Mr Dorsey for spreading himself too thinly by running both , a fast-growing fintech company where he will continue to serve as chief executive.Mr Dorsey’s very first move, on December 1st, was to give Square a new name: Block. The firm has existing plans to expand in blockchain technologies; if it is to satisfy Mr Dorsey’s interest in bitcoin, a cryptocurrency, it will have to move fast. (The chairman of ’s parent company is a director of Block.)