I checked under Listing and they are aware that Auctiva is down for now. Of course that was earlier this afternoon so no idea how long it is going to take. My past experience with Auctiva tells me to start using my back-up ****** or ebay.
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 .