Spammers have been a bane for this site for quite some time. Recently I found a new method to make it much harder for them to foul up our site by adding a question that is easy for humans to answer while stopping the automated spambots. I've adapted Stefan Geens' simple Turing test. Spammers will need to actually come to the site to see what question we're asking in order to automatically post to this site. Fortunately, if they go to that trouble, I'll just change the question.
Let me know if you have any troubles.