I wish when you filtered someone (i have no one filtered btw) that it actually removed them from your view entirely. So not only could they not post on your blogs or message you but that you didn't have to see their inane blogs, play with them in games or have any awareness that they existed on the website at all.
If they were in stars they came up as a blank box. Just gone, never to bother you at all. That would be excellent.
Alas, i assume it is probably too difficult to make happen on this website unlike on forum based websites where it can happen.