Holocaust survivors around the world are lending their voices to a campaign launched Wednesday targeting Facebook head Mark Zuckerberg, urging him to take action to remove denial of the Nazi genocide from the social media site.

Coordinated by the New York-based Conference on Jewish Material Claims Against Germany, the #NoDenyingIt campaign uses Facebook itself to make the survivors’ entreaties to Zuckerberg heard, posting one video per day urging him to remove Holocaust-denying groups, pages and posts as hate speech. Videos will also be posted on Facebook-owned Instagram, as well as Twitter.

Zuckerberg raised the ire of the Claims Conference and others with comments in 2018 to the tech website Recode that posts denying the Nazi annihilation of 6 million Jews would not necessarily be removed. He said he did not think Holocaust deniers were “intentionally” getting it wrong, and that as long as posts were not calling for harm or violence, even offensive content should be protected.

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