The issue with preview is being fixed as we speak. Users will not see any downtime for this. However, it will take a few minutes to get put onto all the individual servers.
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When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .