Facebook is testing a downvote button, but only for comment moderation

Today, screenshots depicting a new “downvote” button on Facebook began circulating on Twitter, leading some to speculate that the social network is actively testing a ranking mechanism similar to Reddit’s community-controlled comment system. The company has officially confirmed the test to The Verge, but a Facebook spokesperson says it’s only intended to be a method for flagging questionable comments on public posts.
Tapping the downvote button hides the comment for the