mk1004 writes "Yahoo news has an article explaining how the text-based CAPTCHA is giving way to ad-based challenge/response. It's claimed that users are faster at responding to familiar logos, shortening the amount of time they spend proving that they are human. From the article: 'Rather than taking just a mere glance to figure out, recent studies show that a typical CAPTCHA takes, on average, 14 seconds to solve, with some taking much, much longer. Multiply that by the millions and millions of verifications per day, and Web users as a whole are wasting years and years of their lives just trying to prove they're not actually computers. This has led many companies to abandon the age-old system in favor of something not only more secure, but also easier to use for your average Webgoer: Ad-based verification, which can actually cut the time it takes to complete the task in half.'"