Anti-bot CAPTCHA widget from Google.
https://www.google.com/recaptcha/intro/index.html
Widgets · CAPTCHA
Get access to data on 36,874,365 websites reCAPTCHA Customers. We know of 12,500,006 live websites using reCAPTCHA and an additional 24,374,359 sites that used reCAPTCHA historically and 2,020,177 websites in the United States.
reCAPTCHA websites that are also using other technologies.
Get a list of 36,874,365 websites using reCAPTCHA which includes location information, hosting data, contact details, 12,500,006 currently live websites and an additional 3,000,469 domains that redirect to sites in this list. 24,374,359 sites that used this technology previouslyand 2,020,177 websites in the United States currently using reCAPTCHA.
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