Google your site and you'll find MY PTC listings and then translate this page and you will see your site on the list. Complete with your cheat test questions and answers. Just by doing this I got to eliminate a whole mess of software cheaters. They have a forum that if you go through it you can get other user names that may or may not be on your site. Getting rid of bot clickers if very time consuming so if you would like help getting them off your site let me know for a small fee I can show you how to spot them.
Of course just don't except members from China, Japan, or India will eliminate the majority of them. Germans are also ones to watch. I must of course credit BGMCK with helping me on this. It was his suggestion that I google my site.