some reading
http://www.theregister.co.uk/2012/01/12/google_search_plus_your_world/
http://www.itbusiness.ca/it/client/en/home/News.asp?id=65642
It looks like this is a new extension on social search, alot of people are up in arms, i have not formed an opinion yet, however it looks cool at this point
Watch a video to learn more about Social Search
see the page on Wikipedia: http://en.wikipedia.org/wiki/Google%2B
Further design developments related to Google+ occurred in January 2012. On January 10, Google released “Search plus Your World”, which inserts content shared on Google+ profiles and brand pages under Web Search results. The feature, which is opt-in, was received with controversy over the emphasis of Google+ profiles over other social networking services’ user profiles (i.e., Facebook and Twitter). The feature builds upon the earlier “Social Search” feature which indexes content shared or published by authors; “Social Search”, however, relied partly upon returns from non-Google services, such as Twitter and Flickr.