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 575 websites that are Google Plus One Badge Customers. We know of 39 live websites using Google Plus One Badge and an additional 536 sites that used Google Plus One Badge historically and 17 websites in the United States.
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Get a list of 575 websites using Google Plus One Badge which includes location information, hosting data, contact details, 39 currently live websites and an additional 28 domains that redirect to sites in this list. 536 sites that used this technology previouslyand 17 websites in the United States currently using Google Plus One Badge.
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