CAPTCHA Fails Protecting Blog Comment Sections Effectively

Updated article (originally published 2008) says CAPTCHA no longer protects blog comment sections because modern AI and low-cost human solvers bypass challenges with AI achieving 99.8% accuracy versus human completion rates of 50–86%. It recommends content-based defenses — notably Akismet (which has flagged over 554 billion spam comments with reported 99.99% accuracy), honeypot fields, rate limiting, and moderation queues — to reduce friction and improve spam detection.