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Once Facebook has changed the permissions on all of your old posts, it will tell confirm that the changes have been made.
4. Click Close to dismiss this box, and return to the privacy settings.
Your block lists allow you to block certain people from seeing you -- to make them 'invisible' to you, and you 'invisible' to them. It also applies to applications, games and invitations to join things. It will be as though these things simply don't exist.
1. Click Manage Block Lists to manage your blocked people and applications.
Where you should be: Account > Privacy settings > Block lists page.
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From here, you can block people by name, or by email address. You can also unblock people, if you wish.
2. If you know the name of the person you want to block, enter the name of the person, search for the correct person, then hit Block.
If, however, you want to block a specific email, then enter the email address and hit Block.
3. If you want to unblock a name or an email address, scroll down until you find the person or email address, and select Unblock.