You must block someone completely from seeing your albums to prevent commenting. Facebook only allows you to control photos you post. Here’s how…
– Click the “Photos” link on your Facebook profile.
– Select the “Albums” link and click on the thumbnail for the album you want to restrict.
– Click the audience selector icon that corresponds to your album. The audience selector icon may look like a lock, a pair of people, the world or a gear depending on your current privacy settings. If you want to edit a Timeline or mobile upload photo, you must click on the photo first to open it before you can change the audience. Select “Public,” “Friends,” “Friends Except Acquaintances,” “Only Me” or “Custom.” If you select Custom, choose an option from the drop-down menu and identify the individuals you want to block from seeing and commenting on your posts.
– Only friends can comment on your posts. Those that aren’t friends won’t have the ability to comment on any of your photos.
– You can’t change the permissions for a Cover photo. Cover photos are always public.
– You must select each photo individually and modify the audience selector settings individually for photos uploaded from a mobile device, Timeline photos or when using an application on your computer such as iPhoto.