Ever see those films showing red blood cells flowing through an artery and veins? Merging in seemingly haphazard fashion and spinning off in other directions at incredible speed? Yeah, that's like a taxi ride in Mexico.
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 .