(GUARDIAN) — 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.

“He’s known how to use it for quite some time. I think it’s an important time for the company and service. And having the president-elect on our service, using it as a direct line of communication, allows everyone to see what’s on his mind in the moment. I think that’s interesting. I think it’s fascinating. I haven’t seen that before.

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