March 2012 Google has implemented the new unified privacy policy. This means all collected browsing history will be available by any other Google product. In other words, you will see targeted ads in YouTube based on your Gmails, and vice versa.
If you want to disable the Google search history, follow these steps:
1. Log on to your Google account.
2. Go to https://www.google.com/history
3. Click “remove all Web History.”
4. Click “ok.”
For more details, see:
https://www.eff.org/deeplinks/2012/02/how-remove-your-google-search-history-googles-new-privacy-policy-takes-effect
URLS:
https://www.google.com/history
