I don't think you could have picked a better time for SB100 in California! Good luck, there are quite a few who know what to do. Look for Barry(Goofycat) or Larry Jowdy to respond, they both know the drill, and can help you.
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 .