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2. CAPTCHA - Wikipedia

   en.wikipedia.org/wiki/Captcha

   This CAPTCHA (reCAPTCHA v1) of "smwm" obscures its message from computer interpretation by twisting the letters and adding a slight background color gradient.A CAPTCHA (/ ˈ k æ p. tʃ ə / KAP-chə) is a type of challenge–response test used in computing to determine whether the user is human in order to deter bot attacks and spam.

3. List of crowdsourcing projects - Wikipedia

   en.wikipedia.org/wiki/List_of_crowdsourcing_projects

   Stardust@Home is an ongoing citizen science project, begun in 2006, using internet volunteer "clickworkers" to find interstellar dust samples by inspecting 3D images from the Stardust spacecraft. Student of Fortune is an online service that allows students to submit homework problems for tutors to answer through a tutorial service for a fee ...

4. reCAPTCHA - Wikipedia

   en.wikipedia.org/wiki/ReCAPTCHA

   reCAPTCHA Inc. [1] is a CAPTCHA system owned by Google.It enables web hosts to distinguish between human and automated access to websites. The original version asked users to decipher hard-to-read text or match images.

5. Amazon Mechanical Turk - Wikipedia

   en.wikipedia.org/wiki/Amazon_Mechanical_Turk

   Workers, colloquially known as Turkers or crowdworkers, browse among existing jobs and complete them in exchange for a fee set by the requester. To place jobs, requesters use an open application programming interface (API), or the more limited MTurk Requester site. [2] As of April 2019, requesters could register from 49 approved countries. [3]

6. Luis von Ahn - Wikipedia

   en.wikipedia.org/wiki/Luis_von_Ahn

   In 2009, von Ahn and his graduate student Severin Hacker began to develop Duolingo, a language education platform. They founded a company of the same name, with von Ahn as chief executive officer and Hacker as chief technology officer. In November 2011, a private beta test of Duolingo was launched and the app was released to the public in June ...

7. Max Levchin - Wikipedia

   en.wikipedia.org/wiki/Max_Levchin

   Levchin made contributions to PayPal's anti-fraud efforts [1] and was the co-creator of the Gausebeck-Levchin test, one of the first commercial implementations of a CAPTCHA challenge response human test. He founded or co-founded the companies Slide.com, HVF, and Affirm. He was an early investor in Yelp and was their largest shareholder in 2012 ...