Facebook is now doing a new feature experience, under which users will be able to downvote on unwanted comments.
This new feature is now visible to only 5% of Android users in the US. This feature has added an extra button for the downvote with reply and link.
By pressing this button, three options appear, users can choose Offensive, Misleading or Off-Topic, by pressing the downvote button. Then Facebook will track such posts and comments or Users who posted such post might also be banned.
This vote button is not to display Dislike, but its goal is to report to Facebook in a very easy way about a comment or post. The DOWNVOTE button is appearing on the public page's post and comments. This currently does not work on posts posted in groups.