Elon Musk’s X said Tuesday it was appointing two new employees to oversee safety on the platform, as it seeks to rebuild relationships with the advertising industry and trust among users. The social media app said that Kylie McRoberts, an existing X employee, was being promoted to head of safety, and that Yale Cohen, an executive vice president at advertising and public relations firm Publicis Media, was joining X as head of brand safety and advertiser solutions. X’s advertising business has had...