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 1,627,057 websites that are Google JS Api Customers. We know of 109,448 live websites using Google JS Api and an additional 1,517,609 sites that used Google JS Api historically and 50,561 websites in the United States.
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Get a list of 1,627,057 websites using Google JS Api which includes location information, hosting data, contact details, 109,448 currently live websites and an additional 139,063 domains that redirect to sites in this list. 1,517,609 sites that used this technology previouslyand 50,561 websites in the United States currently using Google JS Api.
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