Google+ +1 Button implementation.
https://developers.google.com/+/plugins/+1button/
Widgets
Get access to data on 2,932,199 websites that are Google Plus One Button Customers. We know of 274,065 live websites using Google Plus One Button and an additional 2,658,134 sites that used Google Plus One Button historically and 113,550 websites in the United States.
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Get a list of 2,932,199 websites using Google Plus One Button which includes location information, hosting data, contact details, 274,065 currently live websites and an additional 130,010 domains that redirect to sites in this list. 2,658,134 sites that used this technology previouslyand 113,550 websites in the United States currently using Google Plus One Button.
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