Personalized search results have been around for quite some time, but they've changed so much that we need a new term for them: private search results. This post is a snapshot of what we're seeing today (including +Post Ads), along with guidance for how best to take advantage of the latest trends.
Understand from an SEO perspective how Google Plus settings influence private search results for Only You, Limited Searches and Public Searches.
"Private Search, with its combination of Google Now and Social Search (aka: Google Plus) represent a big percentage of the SERPs users see, and its majority in case of mobile search users on Android devices.
Google Plus, then, due to its cross-product platform nature, influences the search experience also of the users not using it as a Social Network."
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