Twitter founder feels 'complicated' about Donald Trump's tweeting

Jack Dorsey says he has mixed feelings about the president-elect's use of the social media service

For the first time, Twitter's chief executive, Jack Dorsey, has described his "complicated" feelings about the US president-elect Donald Trump's use of the social media service.

Speaking at the Code Commerce conference in California, Dorsey demurred when asked if he felt responsible for Trump's election. "America is responsible for Donald Trump being president," he said, before conceding that, more than any other candidate, Trump excelled in his use of Twitter.