Earlier this year, Facebook confirmed it was testing Reddit-style upvote and downvote buttons on public posts. Now, it appears the feature is rolling out to a greater number of users.
… With its downvote button, Facebook is putting a lot of faith into its users. It wants people to use it to flag what Facebook calls “bad comments,” which it defines as having “bad intentions or is disrespectful.” It’s making great pains to emphasize that this isn’t a dislike button. That said, it’ll probably be used that way.