If I said that in my opinion
AdSense : behaviorial targeting :: hydrogen bonds : van der Waals forces
how would you interpret that?
Update, 6/24/2007: In the same way that hydrogen bonds are much stronger than van der Waals forces, I personally consider AdSense targeting stronger than behavioral targeting. Why? Because behavioral targeting might learn that I like TiVo or Terry Pratchett, but I don’t want to see TiVo ads everywhere I surf on the web. But suppose someone sends me a link to a lolcat page and I go there. At the moment I’m on the lolcat page, you know I’m interested in that topic at that moment, because I chose to go there. So AdSense, by targeting to the content of a page, is more likely to show relevant ads based on my interests at that instant. Just my opinion.