You are going to block this site. This will do the following:
- You will no longer see this site in searches.
- Site will no longer see your site in searches.
- Site will not be able to comment on your site profile.
- Any comments this site has posted to your profile will not be displayed.
Are you sure you want to do this?
Concerning your latest update... It's possible to delete your activity (I, too, do not like people seeing things out of context), so that no one sees it but you (unless they actually guess the exact URL).