"strong signal about the user's interests." I would also note that by only advertising to those already looking at cat websites, advertises are missing out on

"strong signal about the user's interests." I would also note that by only advertising to those already looking at cat websites, advertises are missing out on those customers that are not giving off strong cat vibes. I'm sure there are plenty of people out there that don't think about their cat enough to search for cat stuff, but that still buy cat food every week. If an advertiser were to run an ad alongside an article about the wild fires, they might reach a wider market. Who knows, they might even convince some folks to get a cat who were not even thinking about it. p.s: And isn't that what marketing is all about - solving problems you don't even have! p.p.s: When you know you have a problem you look at a catalog, not ads. p.p.p.s: Also, bubbles.