Google will now display results from Google+ posts. This is part of the Google Social Search Project and Google+ joins the ranks of Flickr, Twitter, Quora and Google Buzz as inputs for Google Search. The way it works is, if you search for something in Google, say “chocolate mousse”, on the search results page, you might see a “Shared by 'so and so'” annotation on a link if one of your contacts in your circles has shared that link. In other words, if a contact on Google+ has posted something on the social network, that link will be annotated as shared by them in future search results.
Google+ shows up in Google search results
Google started the Social Search Project in 2009 during Web 2.0 in somewhat a response to Bing's integration with Facebook and Twitter. The service is basically a highlighting mechanism for what your friends are sharing on the social networks. Google+ integration into this project is only the beginning of what's to happen with the social network. Google wants to bring back real time search using Google+ data as well as have a service dedicated to Google+ search.