Where's Gordon - Started...

A discussion or thread that was very interesting but I can't find it. It was about his research on classified ads, and what has been done over the last 50 or even 100 years. I can't remember if he was going to turn this information into a product, but if anyone remembers the post I am talking about please let me know.

I wrote Gordon about this and he was kind enough to respond but I confused him and he thought I was talking about doing classifieds as in starting your own small newspaper.

Any help would greatly be appreciated. Thanks

Dave Roberts