Anti-bot CAPTCHA widget from Google.
https://www.google.com/recaptcha/intro/index.html
Widgets · CAPTCHA
Get access to data on 35,447,930 websites reCAPTCHA Customers. We know of 17,374,687 live websites using reCAPTCHA and an additional 18,073,243 sites that used reCAPTCHA historically and 2,473,041 websites in the United States.
reCAPTCHA websites that are also using other technologies.
Get a list of 35,447,930 websites using reCAPTCHA which includes location information, hosting data, contact details, 17,374,687 currently live websites and an additional 3,083,043 domains that redirect to sites in this list. 18,073,243 sites that used this technology previouslyand 2,473,041 websites in the United States currently using reCAPTCHA.
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