CAPTCHA
CAPTCHA
Test to determine whether a user is human.
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Readers' pathsAug 2026 – Oct 2026
Readers go next to
Share of the 9,338 clicks on its links
ReCAPTCHA
CAPTCHA implementation owned by Google.
37%
Turing test
Test of a machine's ability to imitate human intelligence.
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Acronym
Abbreviation consisting of initial letters of a phrase.
6.5%
Luis von Ahn
Guatemalan-American entrepreneur and software developer.
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Online slang and alternative orthography.
2.9%
Cloudflare
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2.1%
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Spambot
Computer spam program (malware).
1.6%
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Type of cyber-attack.
1.2%
Spamming
Unsolicited electronic messages, especially advertisements.
1.1%
Readers come from
Share of the 6,074 readers arriving from another article
ReCAPTCHA
CAPTCHA implementation owned by Google.
38%
Luis von Ahn
Guatemalan-American entrepreneur and software developer.
14%
Turing test
Test of a machine's ability to imitate human intelligence.
5.8%
Max Levchin
Ukrainian-American software engineer.
4.5%
Cloudflare
American technology company.
4.2%
Alan Turing
English computer scientist (1912–1954).
3.7%
Acronym
Abbreviation consisting of initial letters of a phrase.
3.3%
AltaVista
Web search engine (1995–2013).
2.8%
Manuel Blum
Venezuelan computer scientist.
2.2%
Anna's Archive
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1.7%