Mark Zuckerberg has been condemned for saying Holocaust deniers were not "intentionally getting it wrong".
Facebook has faced difficult questions about how it deals with hate speech on the social media and Mr Zuckerberg, its founder and chief executive, cited Holocaust denial as something the site might leave up.
During an interview on tech podcast ReCode, Mr Zuckerberg said: "At the end of the day, I don't believe that our platform should take that down because I think there are things that different people get wrong... I don't think that they're intentionally getting it wrong."
He also said: "It's hard to impugn intent and to understand the intent. I just think, as abhorrent as some of those examples are, I think the reality is also that I get things wrong when I speak publicly."