Google+ +1 Button implementation.
https://developers.google.com/+/plugins/+1button/
Widgets
Get access to data on 2,904,280 websites that are Google Plus One Button Customers. We know of 275,845 live websites using Google Plus One Button and an additional 2,628,435 sites that used Google Plus One Button historically and 113,759 websites in the United States.
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Get a list of 2,904,280 websites using Google Plus One Button which includes location information, hosting data, contact details, 275,845 currently live websites and an additional 128,417 domains that redirect to sites in this list. 2,628,435 sites that used this technology previouslyand 113,759 websites in the United States currently using Google Plus One Button.
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