During the [Wall Street Journal]'s Tuesday test, searches for hot-topic terms like "Las Vegas shooting" and "NFL anthem protest," along with the term "9/11," each brought up top-five video posts, specifically listed in the site's "Top News" box, whose titles and content were loaded with debunked and misleading content. The fifth result for "Las Vegas shooting" was titled "Proof Las Vegas Shooting Was a FALSE FLAG attack—Shooter on 4th Floor" and claimed that multiple shooters had been involved, in spite of Vegas officials stating otherwise.

https://arstechnica.com/gaming/2017/10/return-of-the-algorithm-monster-youtube-auto-promotes-conspiracy-theory-videos/