Oh my gosh, now I see that!! Thank you so much. I've had this out on my table for months trying to figure it out. I had a feeling it would be something obvious that I just was not seeing!
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 .