The outcome of the poll adds another disruption at the top of Twitter, which has suffered waves of leadership upheaval. Co-founder and former CEO Jack Dorsey handed over running the company little over a year ago after a bruising battle with an activist investor. His successor, Parag Agrawal, lasted less than a year and was fired by Mr. Musk immediately after he took over the company in October. Mr. Musk also ousted several other top Twitter executives, and more have resigned since.