SAN FRANCISCO: Elon Musk has chosen top ad executive Linda Yaccarino to take the day-to-day reins of Twitter as he fights to reverse the tide at the struggling platform he bought for $44 billion last year.

Yaccarino is a highly respected advertising executive who stepped down from NBCUniversal “effective immediately” on Friday as rumors swirled that she would replace the mercurial tycoon as Twitter CEO.

Twitter is struggling to find its footing after Musk’s controversial takeover that saw him fire thousands of staff and welcome back far-right and controversial figures on the platform, scaring off its highest paying advertisers.

Musk on Thursday teased Yaccarino’s hiring, saying in a tweet that he had hired a woman to replace him as boss of Twitter and its newly named X Corporation parent, but without revealing the name.

Yaccarino’s departure from the company that owns NBC, Universal and Telemundo — where she has been since 2011 — came a few weeks after she interviewed Musk at a marketing conference in Miami. Asked by Yaccarino at the time how it’s been going since the acquisition, Musk replied: “It’s going well...It’s entertaining....It’s a trainwreck sometimes.”

Yaccarino will face an uphill battle trying to lure back major advertisers that are afraid of unwanted associations with conspiracy theorists and far-right content makers who Musk encouraged back to Twitter.

As a leading member of the US media establishment, Yaccarino’s hiring blindsided that audience, with her senior role at the World Economic Forum especially singled out for vitriol.

Yaccarino “is a vaccine-pushing, pro mask-wearing, WEF globalist,” wrote conservative website Outkick.

In a tweet, Musk said he would remain in charge of design and technology at Twitter, with Yaccarino focusing primarily on business operations and turning Twitter into an “everything app” called X.

Musk’s history with the letter X goes back to 1999 when he helped created X.com, an online bank that was bought and later morphed into PayPal.