Elon Musk has announced he has found a new Twitter chief executive – but is yet to name her.

“Excited to announce that I’ve hired a new CEO for X/Twitter. She will be starting in ~6 weeks!” Musk said in a tweet on Thursday.

He added that his role within the company will transition to “exec chair and CTO, overseeing product, software and sysops”.

But having not named any prospective candidates, the mystery over who exactly the newly appointed chief executive is continues.

In December, the 51-year-old said he would resign as chief executive “as soon as I find someone foolish enough to take the job”.

This came after a poll on the social media site, where 57.5% of users voted for him to leave the position that he took on after buying the platform for $44bn (£35bn) last year.

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Last month, Musk was reminded of the pledge during an impromptu interview on the BBC, where he said: “I did stand down. I keep telling you I’m not the CEO of Twitter, my dog is the CEO of Twitter.”

Since taking on Twitter, Musk has regularly made light of any controversies, but investors in Tesla have become increasingly concerned that he has been devoting too much time to turning around the platform.

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During his first two weeks in the job, he quickly fired Twitter’s previous chief executive, Parag Agrawal, and other senior leaders and then laid off half its staff in November.

In April, Twitter started to remove its blue ticks from verified accounts, leaving some of the world’s best-known figures without the verification sign.

The platform had about 300,000 verified users under the original blue tick system, many of them athletes, musicians, journalists and other public figures.