AT&T, for some odd reason, seems to have a thing for advertising on my proxy sites. I wouldn't normally mind, but do in this case because they their ads pay very little. So I blocked att.com using the competitive ad filter a while ago and went my merry way. Four days ago, the ads came back. I was shocked and appalled. How could the ads show up after I had blocked them? Well good friends, it seems AT&T's ethics are bad all around. Instead of making att.com the URL of the ad, they changed it to some address at centrport.net and left the display URL to AT&T. I blocked centrport.net, but today, I noticed the ads have come back! And from centrport.net, too! And to top it off, their ads are now being displayed in all my ad spaces, not just one! It would seem as if the competitive ad filter had "magically stopped working". This is total BS. AT&T is probably paying Google some enormous chunk of money so they can abuse the rules and change their URLs. And I'm sure Google's so called "competitive ad filter" is meant to work so that some URLs can not be blocked quickly.