Brian Messenlehner

Display a Google+ Direct Connect Badge on your site via widget or shortcode, allow your members to login/register via their Google+ account or sync your Google+ stream with your blog posts or BuddyPress activity via the Google+ API.
WordPress Google+ Connect allow your website members the ability to register and/or log in via their Google+ account utilizing the Google+ API. Set up a Google Plus Application and store the API credentials in the WordPress backend, when a user clicks on the “Login with Google+” button that gets added to the WP log in screen or anywhere via a short code and authenticates their Google Plus account a WordPress account will be created with their G+ information and they will automatically be logged in. Any existing WordPress users can also log in via Google+ and link their two accounts.
If BuddyPress is enabled a Google+ login button will appear on the sidebar login and the registration page. Google+ profile photos will also be imported in as BuddyPress avatars. Members can stream their Google+ activity into their BuddyPress activity if they choose via the Google+ options screen under the logged in BuddyPress members profile settings page. A cron job runs every 30 minutes to import any new Google plus activity from connected users.
Configure Google+ Direct Connect and help visitors find your Google+ page and add it to their circles from directly within a Google Search.
Configure your Google+ Badge and allow visitors to directly connect with and promote your brand on Google+. Visitors can also add your Google+ page to their circles directly from your website. Badges are easy to configure and can be placed on your website via a short code or a widget.

WP Google Plus Connect

Add Google+ Direct Connect Badge & allow your WordPress/BuddyPress users to register or login via their Google+ account & import their stream  …

chetansingh2410

WP Interactive Posts
Save time and frustration fiddling with annoying and complicated code – simply install the WP Interactive Post plugin, and start benefiting from customised G+ shares with Interactive Post Labels – effort free!
Demo Url : http://googleplus-one.co.uk
This plugin allows you to have interactive sharing on all your pages. Customise the button to read : share, post, Happy Monday, if you fancy.
You can customise the button in the Google+ share : read, read more, connect, from a selection of options provided by Google.
You do need to create and allow an api access, we direct you to the page and provide screenshots and information for you to follow to successfully find your api code.﻿
What is Google+ Interactive Sharing?
Interactive posts provide an easy and eye catching way to allow visitors on your site to share your site or app with their Google+ circles Interactive posts can drive new users to your site, improve conversions, and increase engagement.
An interactive post in the Google+ stream is similar to a basic shared post but adds a call-to-action button and support for deep linking.
See Google: https://developers.google.com/+/web/share/interactive
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WP Interactive Posts

Plugin for interactive sharing on all your pages and posts on Google Plus

WP Google Plus Connect vs WP Interactive Posts