Google+ +1 Button implementation.
https://developers.google.com/+/plugins/+1button/
Widgets
Get access to data on 2,895,796 websites that are Google Plus One Button Customers. We know of 278,178 live websites using Google Plus One Button and an additional 2,617,618 sites that used Google Plus One Button historically and 115,105 websites in the United States.
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Get a list of 2,895,796 websites using Google Plus One Button which includes location information, hosting data, contact details, 278,178 currently live websites and an additional 131,175 domains that redirect to sites in this list. 2,617,618 sites that used this technology previouslyand 115,105 websites in the United States currently using Google Plus One Button.
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