Something happened to this place yesterday afternoon. For about 10 minutes I lost my link to it, then when it came back I could no longer post in several threads (though others seem to work).
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 .