But false claims cannot be easily fact-checked or removed during a livestream, and the growing prevalence of apps such as TikTok has made it harder to weed out bad actors.
“If this election is won using disinformation, this will become a tried and tested formula that will be used in every election,” Ms. Robredo warned in a speech to the Catholic Church, urging people in the Philippines not to believe the lies the internet.
Yvonne Chua, who leads Tsek.ph, an independent fact-checking project in the Philippines, said in an email that the fact checks from its partners pointed mostly to Mr. Marcos’s supporters, who “engage in fire-hosing a lot.”
“You also see incorrect information coming from certain candidates, but these are rare,” said Professor Chua, who is an associate professor of journalism at the University of the Philippines.
Mr. Agravante, who promoted the debunked theory about Mr. Marcos’s wealth, was a call-center agent before deciding to become a full-time YouTuber last year, producing amateur videos for his 109,000 subscribers. A longtime supporter of Mr. Marcos, he knows the candidate has refuted the claim about the gold. Still, Mr. Agravante is unapologetic.
“Why would I change my mind just because he denied it?” he said.
The power of amateur videos like the ones produced by Mr. Agravante is that “they appear authentic or organic,” said Jonathan Corpus Ong, a disinformation researcher at Harvard. “They sound like the language of the streets or the ordinary person, as compared to the professionally produced ads and music videos of the Robredo campaign.”