Google treate Google+ just like any other page on the web. Google Plus content will be efficiently indexed by Google, it will gain page rank and appear in Google’s search results.
Google Plus content you publish, stays around and gains page rank, gives page rank and appears in search results over a long period. It appears Google Plus posts can retain ranking indefinitely with some posts over a year old still top of search result pages. Compare this to the 15 minutes of life a standard tweet is estimated to have.
Posts you create, allow you capture SERP real estate as they appear on Google search page results, thus your audience may find your Google Plus content through a standard Google search.
Google+ authorship provides you with a higher visual profile in search results. By validating your Google Plus profile with sites where you publish, you will enable your image to appear next to the search results and attract greater visual attention on search pages.
Use of Google authorship is tied to content authority. Google will give a higher profile to authoritative content in search results. If an author posts interesting content which is shared and receives plus ones, this will potentially lead to higher authority. There is growing evidence that Google+ authorship improves your authority and search performance.
Google Plus authorship and the Google Plus social layer provides a wide range of social signals that may improve the social media optimisation of your content and SEO. This is more complicated as the number of followers, people in your circles or number of Plus Ones. What appears to be far more important is the interaction between you and your content and others of a high authority. (F.eks) If a high authority person shares your content this will improve your own authority.
Social signals from platforms will become more important in determining search results. This is the social media optimisation (SMO) of SEO. Social signals provide a much better way of filtering out the noise and improving the quality of search results. This is a trend that will continue because it is a much better way of understanding what people really want, which is one of Google’s founding principles.”
The featured link in a Google Plus post will pass page rank to the page to which it links. Note there is a no follow for links included in the body of a Google Plus post, you must use the featured link. If you connect a Google Plus page to your website this will increase the relevancy of your website content and support your search ranking. Links from regular websites to Google Plus content can also pass page rank authority in the other direction back to your Google Plus posts and pages.
The use of hashtags (#), in Google Plus connects every post to a search on the platform.