Google+ badge allows visitors to engage with you directly from the badge itself.
https://developers.google.com/+/plugins/badge/
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Get access to data on 573 websites that are Google Plus One Badge Customers. We know of 41 live websites using Google Plus One Badge and an additional 532 sites that used Google Plus One Badge historically and 18 websites in the United States.
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Get a list of 573 websites using Google Plus One Badge which includes location information, hosting data, contact details, 41 currently live websites and an additional 29 domains that redirect to sites in this list. 532 sites that used this technology previouslyand 18 websites in the United States currently using Google Plus One Badge.
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