Google announced back in January that on March 1st, your Google web search history will be made available to all Google properties (YouTube, Google+, Gmail, etc.) as part of their new privacy policy. If you don’t like that idea, you have about a week left to delete your search history. Here’s how you do it.
Log in to your Google account, then visit your Google Web Search History page. You’ll see all your searches and site visits listed. Click the box at the top labeled “Remove all Web History” to remove everything, or tick the checkboxes next to the list items you wish to delete and click the Remove button.