If the import doesn't work for you, try a 'Snipe It Now' link on your toolbar. That's what I use all the time. That will let you enter a snipe from eBay. (uses a pop up window)
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 .