In a statement, a Facebook spokesperson said attempts to unmask the whistleblower violate its policies around coordinating harm, which prohibits content “outing of witness, informant or activist.”

“We are removing any and all mentions of the potential whistleblower’s name and will revisit this decision should their name be widely published in the media or used by public figures in the debate,” the spokesperson said.

Facebook on Wednesday took down ads purporting to name the whistleblower after critics questioned the company’s ability to enforce its policies. The ads were viewed several hundred thousand times, according to The Washington Post. Facebook’s decision affects all posts on the site, not just ads.