An interesting article by Sally Ormond, who is a regular and expert author on Web Pro News. She references the benefits of Using Google+ and uses. Is Google + an SEO Tool and should it form part of your marketing strategy?
Google+ has never been (and is unlikely to become) an SEO sure thing. Certainly, the public content and links offer potential SEO benefits, but they should by no means be the sum total of your SEO efforts. One of the main benefits is Authorship that places your Avatar beside your content in the search results, which potentially offer a visibility benefit over the other search results, but that’s pretty much it.