Google+ +1 Button implementation.
https://developers.google.com/+/plugins/+1button/
Widgets
Get access to data on 3,018,838 websites Google Plus One Button Customers. We know of 259,737 live websites using Google Plus One Button and an additional 2,759,101 sites that used Google Plus One Button historically and 112,601 websites in the United States.
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Get a list of 3,018,838 websites using Google Plus One Button which includes location information, hosting data, contact details, 259,737 currently live websites and an additional 140,297 domains that redirect to sites in this list. 2,759,101 sites that used this technology previouslyand 112,601 websites in the United States currently using Google Plus One Button.
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