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How to Block Someone From Commenting on Facebook posts, activity and photos
To prevent someone from commenting on your Facebook posts, activity, and photos, do the following;
1. Open your Facebook account
2. Click the V-like shape icon at the top right corner of any Facebook page
3. Next, you’ll need to click Settings from the drop-down menu
4. Click Privacy at the left column on the next page that appears
5. On your Privacy Settings and Tools page, click edit next to Who can see your future post?
6. Click on the Only Me button to initiate a drop-down menu
7. Next, click see all from the drop-down menu
8. Click Customize from the pop-up
9. Enter the name of the person accordingly in the spaces provided
10. Finally, click saves changes and you’re done.