We all know that Google tracks everything that you do, from your home IP Address (they know who you are), on its properties. This includes search. See the video below for a visual example of the potential power this represents for Google, and the potential threat it is to you.
Looking for an Alternative to Google? Try Startpage.
By using Startpage for search you get the quality of Google Search results, without results tailor made to fit what think you want to see based on your previous searches, or by divulging you deepest secrets to a major “for profit” corporation in the form of search queries from you home. It doesn’t matter whether you are signed in or out of Google, they know who you are.