No problem from me. You learn more about AS all the time. And then there are those AS people who keep teasing us with upcoming new services but won't tell us anything more about it...huh, ADAM!
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 .