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The purpose of CAPTCHAs is to prevent spam on websites, such as promotion spam, registration spam, and data scraping. Many websites use CAPTCHA effectively to prevent bot raiding. CAPTCHAs are designed so that humans can complete them, while most robots cannot. [ 14 ] Newer CAPTCHAs look at the user's behaviour on the internet, to prove that ...
Luis von Ahn (Spanish: [ˈlwis fon ˈan]; born 19 August 1978) is a Guatemalan entrepreneur, software developer, and consulting professor in the Computer Science Department at Carnegie Mellon University in Pittsburgh, Pennsylvania. [2][3][4][5][6] He is known as one of the pioneers of crowdsourcing. He is the founder of the company 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.
By country or region. Comparisons. v. t. e. Z-Library (abbreviated as z-lib, formerly BookFinder) is a shadow library project for file-sharing access to scholarly journal articles, academic texts and general-interest books. It began as a mirror of Library Genesis, but has expanded dramatically. [6][7]
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4chan Homepage on May 3, 2023 Type of site Imageboard Available in English Owner Hiroyuki Nishimura Created by Christopher Poole URL www.4chan.org Commercial Yes Registration None available (except for staff) Launched October 1, 2003 ; 20 years ago (2003-10-01) 4chan is an anonymous English-language imageboard website. Launched by Christopher "moot" Poole in October 2003, the site hosts boards ...
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