Does everyone realize that there are 2 notifications of private messages -- one on the screen when you enter the message board -- and one in private email?
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 .