Maybe I'm blind, but none of the templates actually use that word (Unless you type it in yourself in your description) Can you be a little more specific?
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 .