How do posts in Vietnamese about financial investments wind up here from non-members? CS really needs a security wall of some kind. C'mon, CS, step up and do it right.
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 .