We just changed to "Random Questions" from reCAPTCHA for the Human Verification setting, and the spammer registrations dropped to only a few per day (we only added a few questions with trivial answers like "what is 1 + 1?"). I had seen that mentioned here a number of times but I couldn't believe it would have that big an effect until I saw it myself. For a while before that we were using something called zbblock, which worked pretty well except that we were occasionally getting members blocked so we finally decided not to use it.
|