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Google tries to defend its Web Environment Integrity
(techreport.com)
This is a most excellent place for technology news and articles.
Another example: latest iteration of Google Captcha. Released with promises to end manually inputting text captchas, the main thing it turned out to check for is whatever you are logged into your google account. If so, you get through automatically, or, at worst have to press a checkbox. If you are not logged in, enjoy selecting fire hydrants and crosswalks.