Google, a major search engine company, has enabled personalized search for signed-in google account users as well as signed out users.  A personalized search is a search that uses one’s previous search behaviors to produce more relevant results.  Previously, only signed-in Google account users can use the feature.  Now all users can either turn the personalized search on or off.  A “View customizations” link appears on the page.  If you click on it, it will show what customizations have been made to your search and it will also allow you to turn off the personalized search feature.  Read more about this feature on Google’s Official Blog.