Mike Cernovich, a far-right social media commentator who sometimes appears on the Infowars conspiracy site, said it's possible to concoct a video in as little as 20 minutes that splices together images and text to create an alternative narrative capable of spreading rapidly on social media.
David Hogg is a 17-year-old senior at Marjory Stoneman Douglas High School and a survivor of the Parkland, Florida, mass shooting that killed 17 people on February 14. He has been featured as a guest on networks like CNN and CBS.
The Facebook post racked up more than 111,000 shares before it was deleted.
In reality, Hogg lived in California for a time, then moved to Florida to finish high school. Here he is in our yearbook from 2015. If a person typed "David Hogg" in YouTube's search bar midday Wednesday, for example, some of the suggestions would include "exposed" and "crisis actor".
The claim was quickly debunked.
And it's not the only time the student newspaper placed Hogg at the school instead of chasing tragedies. The shooting in question left 17 Marjory Stoneman Douglas students and faculty members dead.
But some uncomfortable facts remain: the video was posted by a Mike M with the username "1234mukk" whose YouTube channel has just 1,274 subscribers - most of which subscribed after his video was flagged by YouTube.
After Hogg's friend put a boogie board on a trash can on the beach, a lifeguard asked him to remove it.
Hogg says he was visiting California, which is corroborated by his personal Twitter account.
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There is also speculation the Russians may be fueling conspiracy theories in a bid to spread discord in America. One of these showed student David Hogg, who has given several TV interviews since the attack.
"I am not a crisis actor", he said.
Some, meanwhile, have used Hogg's criticism about the Federal Bureau of Investigation, combined with the fact that his father is a former Federal Bureau of Investigation agent, to suggest some conspiracy aimed at hurting President Donald Trump.
The president's son, Donald Trump Jr., was among the many people who "liked" a tweet criticizing Hogg.
The conspiracy theories have spilled into the ranks of government, too.
An aide to Florida State Representative Shawn Harrison was sacked on Tuesday after he falsely accused two Marjory Stoneman Douglas High School students of being actors, the New York Times reported. Kelly has since been fired. "Since the algorithm is optimizing for watch-time, it figures that recommending conspiracy theories is efficient". "I'm not a crisis actor", Hogg told CNN's Anderson Cooper on Tuesday.
"I am not an actor in any way, shape, or form", he said.
"I still hunt with my son but an AK-47 and an AR-15 is not for hunting, it's for killing", said Nelson to applause.
"I'm the son of a former Federal Bureau of Investigation agent and that is true, but as such it is also true that I go to Stoneman Douglas High School, I was a witness to this", he added.