Quoting from
http://www.theregister.co.uk/2009/06...oogle_privacy/
Google's targeted advertising program AdSense is even more intrusive
than the controversial Phorm and NebuAd systems. For example, Gmail
scans your personal communication for keywords - there is no opt-out,
and using a secure tunnel is no protection. More recently, Google has
stepped up the aggressiveness of its program by shifting the tracking
cookie used by AdSense from an opt-in to an opt-out system of consent,
where opting-out requires arcane knowledge on the part of the consumer.
Can someone please explain how this 'opt-out' works in practice?
Cheers