FAP, June 6 / PRNewswire-FirstCall-Asianet /-- Twitter's new CEO Linda Yakarino tweeted on the evening of June 5 local time that she had started working on the social platform. Yakarino used to be the director of advertising at NBC Global. Musk had previously said that Yakarino would help build a "universal application". Joe Bernarok, a former NBC Global executive, also joined Twitter on the 5th, responsible for business operations.