Makes sharing on Google+ easy
https://developers.google.com/+/plugins/share/
Widgets
Get access to data on 330,647 websites that are Google Plus One Share Button Customers. We know of 54,064 live websites using Google Plus One Share Button and an additional 276,583 sites that used Google Plus One Share Button historically and 37,125 websites in the United States.
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Get a list of 330,647 websites using Google Plus One Share Button which includes location information, hosting data, contact details, 54,064 currently live websites and an additional 31,848 domains that redirect to sites in this list. 276,583 sites that used this technology previously and 37,125 websites in the United States currently using Google Plus One Share Button.