Check out the underlying psychological reasons for the present state of affairs is Washington DC, courtesy of AOL, Warner Brothers, MySpace, and Pinky and the Brain... http://video.aol.com/video-search/id/294872976
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 .