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 1,698,714 websites Google JS Api Customers. We know of 132,262 live websites using Google JS Api and an additional 1,566,452 sites that used Google JS Api historically and 61,879 websites in the United States.
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Get a list of 1,698,714 websites using Google JS Api which includes location information, hosting data, contact details, 132,262 currently live websites and an additional 129,628 domains that redirect to sites in this list. 1,566,452 sites that used this technology previouslyand 61,879 websites in the United States currently using Google JS Api.
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