If you have a Google account of any kind, then the chances are they are recording your web history. You can delete this and "pause" recording of your history by going to:
https://www.google.com/history/
You can also change other settings related to your Google accounts here:
https://www.google.com/settings/
The privacy settings are here:
https://www.google.com/settings/privacy
You might want to go to
https://www.google.com/settings/general
and change those sites that are allowed to use your Google Login to supply you with customised "information".
Finally, you may want to browse this, just to check:
https://www.google.com/dashboard