reCAPTCHA
So I was on a site the other day and was prompted with a not so uncommon captcha prompt. A major 3rd party supplier of these (including on the comments here) is reCAPTCHA. They actually have an interesting twist of it. reCAPTCHA’s motto is “Stop Spam, Read Books”. So apparently what they do is use the millions of captchas served daily to convert scanned books into text. Computers don’t always do the greatest translating scanned images into text. So they use feedback from all the different captchas to translate these captchas into text. Supplying one known distorted text and an unknown text thus stopping spam and reading books!
