in 1995, I thought that it would be good if advertisements could be served from hubs to large numbers of web sites. That would mean that advertisers wouldn't ha

in 1995, I thought that it would be good if advertisements could be served from hubs to large numbers of web sites. That would mean that advertisers wouldn't have to hire ad space salespeople, which was far too expensive for most sites. But then there was the problem of how to decide which ads to show to which visitors to those sites. To do that, it seemed like it would be a good idea to base that decision on the sites people tend to visit, which seemed like it would maximize the probability that they'd actually be interested in the ads. I looked for a way to do that. Browser cookies seemed like a possibility, until I learned that one site couldn't read another site's cookies. When I asked people if there was any workaround I was told that there wasn't. But then I figured out how to use them to track people anyway. That hack is my answer to the OP. I filed a patent in 1995 that showed how to do it. The patent tied that technique to my specific mathematical technique for selecting the ads the user would most likely be interested in, so it could not be used to restrict other people from using cookies that way as long as they didn't also use my specific math. The patent also contained a lot of features about how to give users complete control over their information and that protected their privacy. (That part didn't get implemented much!) I eventually sold the patent to DoubleClick, and DoubleClick was eventually sold to Google for an amount I recall to be in excess of $1 billion. By then I'd seen a marketing site recommend that Google buy DoubleClick, with my patent listed as one of the reasons they should. DoubleClick had their own patent describing the tracking cookie, but their priority date was a couple months later than mine. And it didn't have the privacy features mine did, or the same degree of tech about how to actually select ads. In defending against a patent troll in 2021, Google and Twitter together filed a joint brief calling the tracking cookie "Robinson's Cookie". My name is Gary Robinson. (In case anyone is curious there's more info at https://www.garyrobinson.net/2021/07/did-i-invent-browser-cookies-for-advertising.html https://www.garyrobinson.net/2021/07/did-i-invent-browser-co....)