This is software that loads onto your PC and lets you right-click on a user to check their feedback. I've not used it and it is, apparently, a bit slow but here's the link:
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 .