I'll be the first one to admit, Google Plus is kind of a ghost town. But, it's owned by Google, being an active user can lead to some pretty impressive SEO implications without much effort. Here's some advice.
This comprehensive Google+ SEO guide covers every aspect and angle of Google+ and how it impacts search.Edit Remove Move
How to use Google+ and Authorship to build your business and increase your share of voice on search engine results. A pretty extensive presentation on using Google+ not only for building your online presence as a creator, but for <b>SEO</b> implications.<br><br>This is a great presentation! <br>Edit Remove Move
The Difference Between rel=author & rel=publisher by Michael Garrity Google conveniently features two distinctly different tags that can be added to a Web page's HTML to promote the individuals that authored a piece of content or an entire brand.Edit Remove Move
How to Auto Post to Google+ Plus from WordPress Blog. Using this tutorial, you'll be able to set up a connection from your Wordpress Blog (.com or .org - both will work) to your Google+ profile so that every time you write a blog post, it will automatically be posted to your Google Plus profile as well. This saves a step for you, and enhances your SEO.Edit Remove Move
It's no secret. When engineers built Google+, they constructed an SEO juggernaut to dominate search results above all other social platforms. Although true that Facebook and Twitter are essential to many marketing efforts, but both restrict Google from accessing much of their data. This article includes an experiment that they performed to prove their hypothesis, and just some high quality info. This is an SEOmoz article. So, it's among some of the best SEO info available on the web. They're experts.Edit Remove Move
A simple cheat sheet for all the different things you can do with Google Plus.Edit Remove Move