On Wednesday, even after YouTube had removed the trending conspiracy video, some of the top search results for "David Hogg" on YouTube included multiple videos targeting the student, including "Who is David Hogg?"
A YouTube spokesperson stated: "This video should never have appeared in Trending".
The company said in a statement that its system "misclassified" the video because it "contained footage from an authoritative news source".
CNBC searched "David Hogg" in GoogleNews just before noon Wednesday, and found false reports listed as "Related Coverage" alongside legitimate reports.
A Twitter user identified as "Laguna Beach Antifa" on Tuesday posted what they said was a photo of Hogg and his classmates in a yearbook, claiming it was from Redondo Shores High School in California and that Hogg graduated in 2015.
Numerous comments on the video uploaded by "mike. m" accuse George Soros and news network CNN of planting Hogg at the scene to vilify gun ownership. After the 2012 mass shooting at Sandy Hook Elementary School in Newtown, Connecticut, some conspiracy theorists said the massacre was staged by the government and accused victims' families of being paid actos.
Since the massacre that killed 17 people, the conspiracy theory has gained traction among Trump supporters and others on the far right who believe - or want you to believe - that the shooting was an Federal Bureau of Investigation plot to seize power from Americans. He also claimed that the students were "milking the death of their peers for careers".
Wiseman had mused on the atrocity previously: "The one thing I would say about the shooting in South Florida is ... if those three adults who use their bodies to protect the children had concealed guns they could've used the guns to protect those children".
YouTube, likemost social platforms, uses algorithms to show you new content that you're likely to watch and share.
Last week's shooting in Parkland, Florida, where a gunman killed 17 students and teachers, was a tragedy.
The title of the now-deleted video was "DAVID HOGG THE ACTOR".