If you are on someone's profile that you would like to follow, you can click the small bell icon next to their name and pick what you would like to receive notifications for. Let me know if you have any questions!
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 .