Google+ +1 Button implementation.
https://developers.google.com/+/plugins/+1button/
Widgets
Get access to data on 2,906,629 websites that are Google Plus One Button Customers. We know of 268,804 live websites using Google Plus One Button and an additional 2,637,825 sites that used Google Plus One Button historically and 111,107 websites in the United States.
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Get a list of 2,906,629 websites using Google Plus One Button which includes location information, hosting data, contact details, 268,804 currently live websites and an additional 123,592 domains that redirect to sites in this list. 2,637,825 sites that used this technology previouslyand 111,107 websites in the United States currently using Google Plus One Button.
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