Anti-bot CAPTCHA widget from Google.
https://www.google.com/recaptcha/intro/index.html
Widgets · CAPTCHA
Get access to data on 35,409,872 websites reCAPTCHA Customers. We know of 12,399,125 live websites using reCAPTCHA and an additional 23,010,747 sites that used reCAPTCHA historically and 2,067,127 websites in the United States.
reCAPTCHA websites that are also using other technologies.
Get a list of 35,409,872 websites using reCAPTCHA which includes location information, hosting data, contact details, 12,399,125 currently live websites and an additional 2,814,837 domains that redirect to sites in this list. 23,010,747 sites that used this technology previouslyand 2,067,127 websites in the United States currently using reCAPTCHA.
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