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A comment on Introducing the Invisible reCAPTCHA. Parent comment

Re:Introducing the Invisible reCAPTCHA by new299 on Thursday March 09, 2017 @08:00AM (#13828936)
Right, but it was really just an extension of the reCAPTCHA technology. Originally applied only to books.

reCAPTCHA was a technology acquired by Google. Not developed in house.

https://en.wikipedia.org/wiki/ReCAPTCHA

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Re:Introducing the Invisible reCAPTCHA by meowface on Thursday March 09, 2017 @10:12PM (#13836020)
The founder, Luis von Ahn, later went on to found Duolingo. Duolingo uses a similar "twofer" crowdsourcing strategy.
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