I've never heard of it before, but I did find this: http://support.google.com/adplanner/bin/answer.py?hl=en&answer=175532 http://support.google.com/adplanner/bi

I've never heard of it before, but I did find this: http://support.google.com/adplanner/bin/answer.py?hl=en&answer=175532 http://support.google.com/adplanner/bin/answer.py?hl=en&... I'm sure the process is fraught with errors, of course, but there does seem to be data to feed the model and data to serve as a test set. The easy thing about targeting ads with demographic data like this (unlike trying to make statistically-accurate statements about demographic data like this), is that if a person responds to some types of ads like a 45-year-old scuba instructor or whatever, it doesn't matter if they really are any of those things.