“Does this post contain hate speech?”
That is the message that thousands of Facebook users have reported seeing on their news feeds.
It seems to be only US-based users that can see the question, which is appearing under every post on their Facebook page.
While some have criticised the social media giant for the move, others are calling it a bug and pointing out the more unusual places where they have seen it appear.
A Facebook spokesperson said they were unable to comment at this time.