Coaches will use your PIN or SS# to access your info on the NCAA Clearinghouse site. They are able to see your core classes if you've sent that info and your initial eligibility.
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 .