Makes sharing on Google+ easy
https://developers.google.com/+/plugins/share/
Widgets
Get access to data on 381,721 websites that are Google Plus One Share Button Customers. We know of 60,907 live websites using Google Plus One Share Button and an additional 320,814 sites that used Google Plus One Share Button historically and 45,252 websites in the United States.
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Get a list of 381,721 websites using Google Plus One Share Button which includes location information, hosting data, contact details, 60,907 currently live websites and an additional 38,344 domains that redirect to sites in this list. 320,814 sites that used this technology previously and 45,252 websites in the United States currently using Google Plus One Share Button.