Ever since Google AdSense began supporting third-party ad serving technology, via DoubleClick technology, Google has required publishers to update their privacy policies to specify so.
Then more recently with the implementation of the behavioral targeted Google ads, Google said the privacy policies need to be updated. They even posted a help document specifying those details.
Many publishers have already updated their privacy policy, because I think the deadline to do so, may have past. But I am confident many publishers didn't do anything or make any change to their privacy policies. In fact, I am not even sure if I have a privacy policy on this site. :)
Did you update your privacy policy based on Google's request? Take our poll:
Forum discussion at DigitalPoint Forums.