Anti-bot CAPTCHA widget from Google.
https://www.google.com/recaptcha/intro/index.html
Widgets · CAPTCHA
Get access to data on 37,099,148 websites that are reCAPTCHA Customers. We know of 11,430,021 live websites using reCAPTCHA and an additional 25,669,127 sites that used reCAPTCHA historically and 1,824,087 websites in the United States.
reCAPTCHA websites that are also using other technologies.
Get a list of 37,099,148 websites using reCAPTCHA which includes location information, hosting data, contact details, 11,430,021 currently live websites and an additional 3,437,455 domains that redirect to sites in this list. 25,669,127 sites that used this technology previouslyand 1,824,087 websites in the United States currently using reCAPTCHA.
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