Linda Yaccarino, NBCUniversal’s advertising chief, was preparing to interview Elon Musk, Twitter’s owner, onstage at a conference last month when she received an email from a peer in the advertising industry.Rob Norman, a former executive at the ad giant WPP, wanted to know if Ms. Yaccarino had seen the op-ed he wrote after Mr. Musk bought Twitter last year. Mr. Norman’s column discussed the tech billionaire’s amplification of misinformation on Twitter and its chilling effect on advertisers.Ms. Yaccarino said that she had and that she planned to raise such concerns, Mr. Norman said. But the main focus of her talk with Mr. Musk would be on something else: His efforts to revamp the social network into “Twitter 2.0.”Now Ms. Yaccarino is set to become the face of Twitter 2.0. Mr. Musk said on Friday that he had selected Ms. Yaccarino, 60, to become the company’s chief executive. Hours earlier, NBCUniversal announced that Ms. Yaccarino was leaving, effective immediately.“I am excited to welcome Linda Yaccarino as the new C.E.O. of Twitter,” Mr. Musk tweeted. He said she would mainly handle business operations while he would continue working on product design and technology.In choosing Ms. Yaccarino, Mr. Musk is signaling what …
