FYI - in vista, I had to type "scan" only in to the search options in the start menu for it to find what I was looking for. If I typed "scan profile editor" it wouldnt pull it up. May be different on XP
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 .