Reply 60 of 809, by VileR
To Vogons admins: you can end this spambot nonsense (~95% of spam posts/accounts are spambots; real people are only 5%) by changing image captcha (which is ocr'ed already) with Q&A captcha (like: 'What's the color of grass' and the expected answer is 'green'). No need to create more strict registration rules. It's implemented in phpbb 3.0.6+, but you can easily implement it here too.
certain spambot software apparently overcomes Q&A captcha by routing questions to human solvers and collecting the answers - seems like this is how a lot of image captcha gets bypassed as well (rather than purely OCRing everything).