https://phys.org/news/2018-07-facebook-fresh-controversy-holocaust-denial.html

In an interview with tech website Recode on Wednesday, Zuckerberg said that while Facebook was dedicated to stopping the spread of fake news, it would not filter out posts just on the basis of being factually wrong—including from Holocaust deniers and the conspiracy theory website Infowars.

"I'm Jewish, and there's a set of people who deny that the Holocaust happened," he said in the interview.