I find it interesting that DoubleClick (Google) claims to have accurate data about HN's demographics when HN doesn't use ads or the DoubleClick network. I've s

I find it interesting that DoubleClick (Google) claims to have accurate data about HN's demographics when HN doesn't use ads or the DoubleClick network. I've seen a few people mention "tracking cookies" that DoubleClick leaves on your machine. Without something on a HN page serving content from an ad network page, cookies won't work that way.