Google+ +1 Button implementation.
https://developers.google.com/+/plugins/+1button/
Widgets
Get access to data on 3,034,979 websites Google Plus One Button Customers. We know of 288,374 live websites using Google Plus One Button and an additional 2,746,605 sites that used Google Plus One Button historically and 127,089 websites in the United States.
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Get a list of 3,034,979 websites using Google Plus One Button which includes location information, hosting data, contact details, 288,374 currently live websites and an additional 163,124 domains that redirect to sites in this list. 2,746,605 sites that used this technology previouslyand 127,089 websites in the United States currently using Google Plus One Button.
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