Like most other sites use this site log files. The information in the log files include the IP addresses, browser type, ISP, times, referring pages m.m. This information is not personally identifiable.
Cookies and Web Beacons
Google’s use of DART cookie allows us to show ads to users based on their visits to your websites and other sites on the Internet. Users can opt out of the use of DART cookie by visiting http://www.google.no/privacy_ads.html.