Twitter named interim chief executive Jack Dorsey as its permanent CEO on Monday.<br />Dorsey has served as interim CEO for the past three months, after former Dick Costolo stepped down on July 1.<br />Dorsey will remain the head of fast-growing mobile payments company Square, potentially setting up a conflict of interests for the co-founder of both companies.<br />Twitter previously said the CEO job would be a full-time position, which seemed to exclude Dorsey as long as he continued to run Square.
