Mr. Musk raised the idea of a chief executive for Twitter in December after he was criticized for some of his decisions at the company. He ran a poll on Twitter at the time asking if he should step down as the head of the company. “I will abide by the results of the poll,” he wrote.
More than 17 million votes were cast in the poll, with some 58 percent of respondents saying they were in favor of him stepping down as chief executive. In February, while speaking at a conference in Dubai, Mr. Musk said he was aiming to name a new Twitter chief executive by the end of 2023.
Twitter’s workers were not notified of a new chief executive before Mr. Musk’s tweet, according to two employees.
Mr. Musk has been under pressure from investors at his other companies — notably the electric carmaker Tesla — to move away from day-to-day management of Twitter. Some of Tesla’s shareholders regard Mr. Musk’s work at Twitter as a distraction.