We connected all insulated outside rails to common ground due to this as a lot of guest MTH F units of all types were doing the same thing. Solved the same issue at switches with the non-derailing feature.
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 .