Anti-Spam Effectiveness

What website are you looking at? Sounds a simple enough question right? Well for a human maybe but perhaps not for a CAPTCHA reading online bot. A problem that’s plagued bloggers and forum administrators for years is how to stay ahead of the comment/post spam that invariably results from putting one of these sites online.

The solution until about a year ago has been to go for a centralised solution like Akismet or make your CAPTCHA ever increasingly harder to read and thus harder to crack. Unfortunately the latter has simply increased the number of frustrated users resorting to e-mail to ask for access or giving up altogether. Akismet has stayed ahead of the curve and for one-off comments on blogs and other types of media has proved invaluable. For forums however there isn’t really a reliable connection between most forum systems and Akismet and administrators have been left wondering what to replace their ageing, difficult to read and fundamentally ineffective CAPTCHAs with.

Welcome the Q&A. While this concept has been around for a while, Q&A really comes into it’s own when you factor in randomisation. If a particular style of CAPTCHA is in use by many sites then it’s well worth a spammer trying to crack it as they reap large rewards. Custom solutions on the other hand have the advantage that unless you run a huge site like BBC News, they’re not going to be worth cracking as there are easier rewards to be reaped elsewhere. While you could use a custom CAPTCHA this requires some effort and you’ll probably end up re-using someone else’s code which defeats the uniqueness objective. This is when we resort to the simple question, unique to every website. Where am I? Who is my admin?

Having implemented such unique questions to all of my forums recently I can report a resounding success. No automated registrations leaving just the handful of spamming manual ones which are easy to weed out of an early morning. The big bonus here is legit users find it a doddle to register as they either know by heart or can easily look up the answer. I also now have the slightly tangential advantage that if I were to start getting automated registrations again then my sites may well have become as popular as BBC News which would certainly bring a smile to the face.

   

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