What is a blocked user, and how do I block a user?

A blocked user is a person who is prohibited from adding you
to their contacts list. Also, blocking a user will block you from seeing any of the user's comments throughout the site as well as block their ability to share submissions with you.

To block a user, either click on the “thumbs down” icon on a comment the user posted or search for the user, and click the “Block User” link that appears in the comments place or to the right of the users name in the search list result. You'll get a message asking if you really want to block this user. This is not to try to change your mind, just to give you a chance to make sure you clicked the right button.