Anti-bot CAPTCHA widget from Google.
https://www.google.com/recaptcha/intro/index.html
Widgets · CAPTCHA
Get access to data on 36,800,218 websites reCAPTCHA Customers. We know of 13,186,539 live websites using reCAPTCHA and an additional 23,613,679 sites that used reCAPTCHA historically and 2,138,342 websites in the United States.
reCAPTCHA websites that are also using other technologies.
Get a list of 36,800,218 websites using reCAPTCHA which includes location information, hosting data, contact details, 13,186,539 currently live websites and an additional 3,347,640 domains that redirect to sites in this list. 23,613,679 sites that used this technology previouslyand 2,138,342 websites in the United States currently using reCAPTCHA.
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