Source: Online tracking: A 1-million-site measurement and analysis
A very solid paper on how you are being tracked online. I had known about Font fingerprinting before (as the list of fonts you have installed is actually pretty unique), but using audio filter fingerprinting, or web rtc to get a list of ip addresses you can reach, is pretty novel. And a bit scary.
Which is all another good reason to install Ad Blocking software today. uBlock is my current favorite.
And now you can do things like go to page 2 of a story, or even use the search box, and not be assaulted by popups and half page expanding ads that push all the content off the page.