This is an excellent new tool for showing exactly what kind of tracking a site is doing:
Who is peeking over your shoulder while you work, watch videos, learn, explore, and shop on the internet? Enter the address of any website, and Blacklight will scan it and reveal the specific user-tracking technologies on the site—and who’s getting your data. You may be surprised at what you learn.
Best of all, you can inspect the raw data and analyse the methodology.
There are some accompanying explainers: