We&#39;ve had the same problems on another board I moderate at. While we use phpBB instead of Invision (IPS), a while back we had decent luck by adding a question "What&#39;s 2+2?" to the registration forum. Maybe something like that can be added? Better yet, something airline-related since I have seen some human-driven advertisers trying to beat the system. Maybe something like "Which airline has Northwest Airlines recently merged with?" or "What is the airport code for Sioux City, IA?" (obviously, that can be looked up easily). I&#39;m sure there&#39;s a possible modification that can be made. If one of the admins (probably nonrev1) is interested, shoot me an email. <myusernameontheboardhere>@gmail.com