You've bought something for youself as a bit of a treat and put it away until you really fancy it, but when you go to the cupboard to get it you find out someone else has scoffed it.
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 .