Robin Good: Here is a truly comprehensive Google+ SEO guide which covers every aspect of Google+ and how it impacts your visibility inside search results.
Key sections in this guide include:
Google+ Search FacetsGoogle+ Search ResultsGoogle+ People and Pages ResultsGoogle+ Search SpamSearch+People and PagesGoogle+ PostsGoogle +1 ButtonGoogle+ Social SnippetsGoogle+ ContentGoogle+ FormattingGoogle+ Brand PagesGoogle+ AuthorshipGoogle+ InfluenceCircle Count
Three key takeaways:
1) Google+ search results are personalized but through some crowdsourcing I’ve been able to determine the search signals.
The most important signal is whether the query term appears in the Introduction, Employment, Education or Places lived section of your profile. Danny Sullivan rarely shows up in a search for SEO because he doesn’t have the term in any of those fields.
2) People and Pages are defined, curated lists of people by topic. That means there’s nothing you can really do to optimize for these slots.
3) Panda separated low-quality and high-quality sites. AuthorRank would do the same for people and their associated content. As the tidal wave of digital content roars in Google’s ears finding ways to sort the good from the bad quickly will be of increasing importance. Content without Authorship could become a second-class citizen.
Google's announcement for Search, plus Your World, opens up new ways of using search as well as an unexpected secondary feature/update which is going to make happy anyone who needs to frequently check Google search results without "personalization".
"Google Search has always been about finding the best results for you. Sometimes that means results from the public web, but sometimes it means your personal content or things shared with you by people you care about.
These wonderful people and this rich personal content is currently missing from your search experience. Search is still limited to a universe of webpages created publicly, mostly by people you’ve never met. Today, we’re changing that by bringing your world, rich with people and information, into search."
Google introduces today three new features:
1) Personal Results
which enable you to find information just for you, such as Google+ photos and posts—both your own and those shared specifically with you, that only you will be able to see on your results page;
2) Profiles in Search
both in autocomplete and results, which enable you to immediately find people you’re close to or might be interested in following; and,
3) People and Pages
which help you find people profiles and Google+ pages related to a specific topic or area of interest, and enable you to follow them with just a few clicks.
N.B.: Google is also introducing a prominent new toggle on the upper right of the results page where you can see what your search results look like without personal content. With a single click, you can see an unpersonalized view of search results.
That means no results from your friends, no private information and no personalization of results based on your Web History. This toggle button works for an individual search session, but you can also make this the default in your Search Settings.