YouTube Vows to ‘Improve Our Systems’ After Conspiracy Video Rises to No. 1 on Trending

On Wednesday morning, YouTube's No. 1 trending video used footage from a CBS Los Angeles video to suggest that David Hogg, one of the survivors of last week's mass shooting at Marjory Stoneman Douglas High School in Parkland, Fla., was an actor and not an actual student at the school. "This video should never have...