To make money from a web site, you need to know how it's being used. You need to know which articles are being read, and which ones aren't. You need to know which adverts or links are being clicked, and which pages your visitors have come from. Some web site operators have narrowed down such diagnostics to a fine art, and this means that they employ the services of many different analytics systems in order to gather that information.
Sometimes, the amount of information being tracked on a web site you visit is astounding. When you analyse the tracking markers placed on a page, and the systems to which they link, and the systems to which those systems link, and so on, you realise just how little of your online privacy remains.
If you want to see the effect for yourself, point your browser at https://www.ghostery.com/en/try-us/request-a-demo/ and enter a web URL into the "test your site now" box at the top of the page. In the case of highly commercialised sites, prepared to be surprised at what you see.
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