Every public post on Facebook allows anyone to see, like, and comment on it. Currently, only users who have enabled the Followershave the ability to choose who can comment on their public posts. The choice is between friends, friends of friends, and everyone.
So, in order for a user to be able to control which users will leave comments on their public posts, they must first activate the ability for other users to follow them and accept their public posts on their home page, without becoming their friends.
Facebook is testing a new option with some users so that users can control comments on their public posts, whether they have the Followers feature enabled or not, according to Sociobits.
What changes in the user settings is the renaming of the "Followers" option to "Public Posts" and the "Follower Comments" and "Follower Notifications" options to "Public Posts Comments" and "Public Posts Notifications" respectively.
The previous function does not affect the ability to view and Like a public post, only the ability for other users to comment.
Source: socialmedialife.gr
