By default,allows anyone, even if it is not your friend on the social network, comment on your posts.This can be a drawback for those users who want a little more privacy in their posts even when public on .
Step 1. The first step is to access your Facebook profile settings, as shown in the image below. Just click on the arrow in the upper right corner and then click on “Settings” in the drop-down menu that appears;
Step 2. On the settings page click on “Public Post” in the left column and, in this section, click on “Comments in Public Post”. Click “Edit” right away;
Step 3. Now in “Comments in Public Post” change the setting to “Friends”.
Ready! Now strangers can no longer comment on your Facebook posts and you gain a little more privacy.