CAPTCHA was developed by AltaVista in 1997 to eliminate bots trying to add spam URLs to search engines. It is said that introduction of CAPTCHA was able to prevent more than 90% of URL addition by bot ...
On 4chan, the world's largest image board with the highest number of hits in the English-speaking world, users must pass a CAPTCHA to prove they are human before posting a message. Full-stack software ...
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