Quote from: MyndFyre on July 28, 2009, 10:12 AMForgive my stupidity but... didn't you just say the same thing as I did in my post, adding porn sites already do the exact same thing as I describe? Although I do think you've misinterpreted what I mean by "resources". I'm talking CPU power and bandwidth.
With a 20 picture quizzes having 10 pictures each, you're looking at 200 different resources. Even though 200 sounds large, it's trivial to have a human solve them and then feed the pairing of questions and answers into a database. I don't think that makes it resource-intensive.
I don't remember which site was doing this - I think a porn site - was showing users free images in exchange for solving Yahoo captchas.
Ultimately I think that you'll see automation techniques continue to be refined and the massive amount of internetworked brainpower continue to try to overcome them.
For clarification, if I was unclear: use a simple system for keeping the web roaming bots off (hidden inputs, whatever; invisible and unobtrusive) and for targeted attacks just limit it to X accounts per IP/user agent/cookie every Y hours. Removal of inactive accounts wouldn't be bad, either.
PS: I tend to use a javascript solution to keep 99% of the bots off, giving users who have javascript disabled the possibility of solving a captcha instead.