We'll create fresh WordPress site with WordPress Plus One Button installed. You have 20 minutes to test the plugin after that site we'll be deleted.
This plugin adds Google Plus One Button to every post on your WordPress Site.
This plugin is simple and uses in built function to display Google Plus
One Button below every post. The size property of the plugin is set to “standard”
and the annotation property is set to “inline”. Read about these properties here
https://developers.google.com/+/plugins/+1button/