If anything goes amiss I have set up a Facebook page that we can use if the site goes away, so if you load it up in a separate window you can switch if need be.
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 .