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 1,594,965 websites that are Google JS Api Customers. We know of 119,470 live websites using Google JS Api and an additional 1,475,495 sites that used Google JS Api historically and 54,558 websites in the United States.
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Get a list of 1,594,965 websites using Google JS Api which includes location information, hosting data, contact details, 119,470 currently live websites and an additional 139,273 domains that redirect to sites in this list. 1,475,495 sites that used this technology previouslyand 54,558 websites in the United States currently using Google JS Api.
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