YouTube Revamped Its Ad System. AT&T Still Hasn’t Returned

AT&T, one of the nation’s biggest marketers, has yet to return to YouTube nearly a year after pulling its advertising from the platform because of concerns that it could appear alongside offensive material.The company was among a wave of major marketers who paused their spending on YouTube last March after it was found that ads were appearing on videos promoting hate speech or terrorism and other disturbing content. The Google-owned video service has since introduced a series of changes aimed at limiting the types of videos that can run ads, and most brands have resumed marketing on the platform.