Elon Musk names Linda Yaccarino new Twitter CEO, ending speculation (updated)
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Current Twitter CEO Elon Musk officially named former NBCUniversal ad executive Linda Yaccarino as the company's new CEO on Friday, hours after she resigned from Comcast (NASDAQ:CMCSA).
In a statement, Musk said that Yaccarino would focus "primarily on business operations" while he focuses on product design and new technology. 
Musk added that he looked forward to working with Yaccarino to "transform this platform into X, the everything app."
Earlier on Friday, Yaccarino said she was leaving NBCUniversal, where she headed up the ad sales team.
"It has been an absolute honor to be part of Comcast NBCUniversal and lead the most incredible team," Yaccarino said in a statement released by Comcast. "Weâve transformed our company and the entire industryâand I am so proud of what weâve accomplished together, and grateful to my colleagues and mentors, especially Brian Roberts, Mike Cavanagh and the entire NBCU leadership team."
In her stead, Mark Marshall was named NBCUniversal's interim Chairman, Global Advertising and Partnerships. Marshall will report to Mark Lazarus, NBCUniversal Television and Streaming Chairman.
Last month, Yaccarino interviewed current Twitter CEO Elon Musk on stage at MMA's POSSIBLE Miami event.
Separately on Friday, the Washington Post reported that Musk had indeed picked Yaccarino to be the social network's new boss.
On Thursday, Musk said he had found Twitter's new CEO and she would be starting in approximately six weeks.
Musk's comments caused Tesla (NASDAQ:TSLA) shares to jump on Thursday and investor optimism continued in early trading on Friday, with Tesla (TSLA) shares up around 2.3%.
Conversely, Comcast (CMCSA) shares were little changed in early Friday trading.
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This story has been updated to confirm Linda Yaccarino is the new CEO of Twitter.