The new online course certification system is available as of Monday September 16, 2019 at 8 AM (EDT.) To use the system you will need to create a user account.
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 .