Google Plus Does Not Have Writing API Till Now So We Can’t Auto-Post To Google Plus.
Than, How Could We Auto-Post To Google Plus From WordPress ?
Here’s A Plug-In for That! 
WPGPlus
Features Of WPGPlus :-
- Auto Publish Posts To Your Google+ Profile
- Based on PHP Script
- Includes Post Excerpt
How To Use WPGPlus Plug-In :-
- First Install The Plug-In From The Above Link
- Now Go To “Settings – WPGPlus
- Enter Your Google Plus E-Mail and Password
4. Now While Writing a Post, Look At The Right Of The Page, You’ll See WPGPlus Options. In That, Choose ‘Yes’ in ‘Publish this post to Google Plus?’
That’s All! Your Post Will Be Published To Your Google+ Profile
Vishesh Kachheda
Founder & Administrator at TechBin.org
Young Blogger Who Loves To Write About Windows, SEO, WordPress, Internet, Software!
Like To Discover Internet and Software!
Owner, Editor, Author of TechBin.org!
Hey there, It's me Vishesh Kachheda!
I am a Music Lover, Student, I Love to write about WordPress, Blogging, Technology, SEO Tips & Tutorials!
I love Blogging & helping other newbies :)
Read more about me 
Received “SSL certificate problem: unable to get local issuer certificate” immediately after publishing.
Removed the plugin
I Have No Idea About The Error
You Can Try Shooting Up Your Question Here – http://wordpress.org/support/plugin/wpgplus
Is posible to use this plugin to publish on a Google+ Page instead the profile?
No, Unfortunately Currently Posting To G+ Pages is Not Yet Supported
This plugin don’t work for me either. You can use hootsuite for this. its the best and reliable way to add your blog posts to g+
Okay
Thanks For Your Suggestion!
It doessn’t work! Not one of my wordpress posts has posted to Google Plus.
Actually, It’s Now Not Working For Me Either
You May Wanna Look-On These Links, Probably These Can Help You :-
http://wordpress.org/extend/plugins/wpgplus/faq/
http://wordpress.org/support/topic/plugin-wpgplus-not-posting-images-truncating-post-text
http://wordpress.org/support/topic/plugin-wpgplus-not-posting
http://wordpress.org/support/topic/plugin-wpgplus-plugin-not-posting-to-g
Great. I was also looking for the same auto poster. I should give a try to this one.
I have also made Elegant Design Social Media Sharing Button as per your requirements; replacing Pinterest Link with YouTube.
I welcome you to download you copy from here
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Thank You Very Much Mubashir, For Appreciating The Post and Transforming The Social Buttons!
Interesting piece bro. I’ll grab it right away and thanks for sharing
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Thank You Very Much For Your Comment Bro!
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Hey Vishesh,
Fabulous. I love leverage in the field of blogging.
Very useful plugin………installing now.
thanks
Akos Fintor
Thank You for Your Appreciation Bro!
Hope To See You Again Here!