Use the Google Loader API. Also see Google API for more generic calls to Google.
https://developers.google.com/loader/
JavaScript Libraries and Functions
Get access to data on 1,707,107 websites Google JS Api Customers. We know of 145,965 live websites using Google JS Api and an additional 1,561,142 sites that used Google JS Api historically and 69,289 websites in the United States.
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Get a list of 1,707,107 websites using Google JS Api which includes location information, hosting data, contact details, 145,965 currently live websites and an additional 149,528 domains that redirect to sites in this list. 1,561,142 sites that used this technology previouslyand 69,289 websites in the United States currently using Google JS Api.
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