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 1,610,044 websites that are Google JS Api Customers. We know of 115,120 live websites using Google JS Api and an additional 1,494,924 sites that used Google JS Api historically and 52,182 websites in the United States.
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Get a list of 1,610,044 websites using Google JS Api which includes location information, hosting data, contact details, 115,120 currently live websites and an additional 130,194 domains that redirect to sites in this list. 1,494,924 sites that used this technology previouslyand 52,182 websites in the United States currently using Google JS Api.
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