More than that - did you know that Google collects and saves all our search activity while we are logged in ? Which is really sucks since as soon as I remember there was not any obvious opt-in notification for this service. Fortunately it is possible to opt-out (turn off your search history) and even delete all personal search history collected for years. More details and how-to guide - here (via John Battelle).
Speaking of personalization I just examined adsense ads on Youtube and they appear to be targeted aggressively towards user logged in. It is not just regular adsense ads. For example user location and age are targeted.
Thursday, February 08, 2007 10:09 PM