I guess they won't give up until they exhaust all the URL shortening services online. How many url shortening service sites are there?

Today they tried a different url shortening site (http://tw.gs/) but the "end destination" (financed e.com/ images/61.gif) remains the same. So, my question for the programmers, is it technically possible to "decode" the 2-layer mockup hyperlinks so our system can outsmart the spammers and block whatever links they make up?