Potku.net being a Finnish site, spam registrations have never been a catastrophic problem for us. However, they have increased in the recent years.
We have been using Q&A for ages. Our previous question was about James Bond. I remember playing around with registration just to see how it works when my Opera browser suggested the correct answer! I still don't understand how that happened. The correct answer was not in the cache or anything like that. But it made me wonder.
In our current question we ask about a country. Is it that the bots just circle all countries until they get it right? But there's a limit of 20 tries. Or are these registrations by actual humans?
Besides Q&A, registration must be verified by e-mail.
Is there something we could do better? We would appreciate all input.