dpchiesa

gplus is a WordPress Plugin.
It provides a WordPress Widget that displays a list of your recent 
Google+ activities in the sidebar. The plugin uses the Google+ API, and 
authenticates via an API key that YOU (the installer) acquire via the 
Google API Console.
Because it uses the public REST API of Google+ that Google documents and 
supports, this plugin is very reliable and simple. (Other WordPress 
widgets that say they show Google+ activity have relied on 
screen-scraping, which makes them brittle and unreliable.)
<h3>Dependencies</h3>
This plugin depends on and uses the published google-api-php-client, 
available at http://code.google.com/p/google-api-php-client/ .
Rather than requires the installer to download this code, it is packaged 
within the plugin. The Google API php client library is licensed 
independently from the gplus WordPress plugin; The former is licensed 
under the Apache 2.0 license.
<h3>Thanks</h3>
Thanks for your interest!
You can make a donation at http://cheeso.members.winisp.net/GplusWidgetDonate.aspx
Check out all my plugins: 
https://wordpress.org/extend/plugins/search.php?q=dpchiesa
-Dino Chiesa

GPlus

chrisguitarguy

agencypmg

Google+ pages can verify their URLs by adding <code><link rel="publisher" href="your_plus_page_here" /></code> to the <code><head></code> section of a website.
This plugin lets you do that.
<a href="http://support.google.com/plus/bin/answer.py?hl=en&answer=1713826" rel="nofollow ugc">More information</a> on the Google+ help pages.

Rel Publisher

Rel Publisher is a simple plugin that lets you easily add <link rel="publisher" /> to your site.

GPlus vs Rel Publisher