Google on Tuesday announced an update "search plus your world" to deliver personalized search results by embedding its social service Google+ to its search engine.

According to Google's official blog, the update will include three features: "personal results" which will enable users to find information just for them, such as Google+ photos and posts; " profiles in search" which will enable users to immediately find people they are close to or might be interested in following; as well as "people and pages" which will help users find people profiles and Google+ pages related to a specific topic or area of interest.

For example, a search for a vacation to Alaska could present not just airline sites but photos that were taken by the searcher' s friend in Alaska and shared with the searcher or posted publicly on Google+ or Picasa.

The features will be available over the next few days to people who are signed in and searching on Google in English, said the company.

Search Engine Land, a tech blog that has been closely following Google, said Google's search results are undergoing the "most radical transformation ever" with "search plus your world."

But Search Engine Land said the new features may cause some privacy worries as private content may appear as it is posed publicly. It might also cause concern by making private content more visible to friends and family than those sharing may have initially intended.

"The new format and features will also likely cause Google to come under renewed fire that it is leveraging its search engine to favor its own content and crowd out competitors," said the blog.

One limitation for the new Google features is that only content from the public web could be revealed in the search, which means large amounts of contents on Facebook, world's largest social network, will not show up.

According to San Jose Mercury News, a daily newspaper in Silicon Valley, a Google spokesman said the search giant was open to working with third parties to open their content to being searched and indexed by Google.

Facebook has allowed many services, like music steaming service Spotify, to become more personalized by showing users content that is related to their Facebook friends. Facebook has been working with Microsoft to allow the software giant's search engine Bing to reveal more personalized content.