Being on Google+ alone can help increase ranking. If you are signed into Google+ and connected with other businesses or people that are on Google+, you are more likely to view content from them in your search results and they will view your content. However, if you are signed out of Google+, Google will not confirm whether aggregate Google+ data will affect whether content from that account will rank better for signed out users. For this reason, it is important to do more than just have Google+. One way to do this is to build Author Rank.
Increasing your rank is all about identity, relationships, and content, therefore it’s all about building relationships, not links. Although not a specific Google system, Google is now performing “Author Rank.” Google Authorship and author rank is the new Search Engine Optimization trend. Google Authorship is a link between the content people write on their website and their Google+ profile. The main objective with Authorship is to determine your Author rank.