ReCAPTCHA is so conceptually flawed that it would be a poor solution even if it weren't cracked. FancyCaptcha is good (but still at least sometimes bypassed in practice), but the requirements for setting it up put it out of reach for many wikis. I'm a fan of QuestyCaptcha, but I'm biased. :-)
On Mon, Feb 27, 2012 at 2:23 PM, Daniel Friesen lists@nadir-seen-fire.com wrote:
But if the bot is smart enough to register for accounts and handle captchas, it might not be easily tripped up by such a simple measure.
Has anybody taken a comprehensive look at the effectiveness of various solutions in practice? Of particular importance would be determining whether CAPTCHAs are usually broken in the wild via OCR or by farming them out to humans.