Linda Yaccarino to replace Elon Musk as Twitter CEO. Here's who she is.

Elon Musk has tapped Linda Yaccarino, until this week the head of advertising at NBCUniversal, to replace him as CEO of Twitter, he announced in a tweet Friday. 

"@LindaYacc will focus primarily on business operations, while I focus on product design & new technology," the tweet read, in part. 

The announcement comes after the billionaire on Thursday tweeted that he had found someone new to lead the social media platform, adding that "she will be starting in ~6 weeks!" Musk, who completed a deal to buy Twitter last fall for $44 billion, will transition to executive chairman and chief technology officer of Twitter.