Learn about tracking technologies, market structure and data-sharing on the web

WhoTracksMe Paper 2018

What is a tracker? Where does this data come from?


GDPR - What happened?

The tracking landscape post GDPR, adverse effects on competition and a market for compliance technologies


Third-party cookies - the guests who won't leave

How the web ecosystem is preventing us from reverting the third-party cookie mistake.


June Update - Do you consent?

The rushed, rough and rogue UX of services getting you to opt-in.

Tracker Market Share

Proportion of the web traffic tracked by these companies.


WhoTracksMe 2018

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Google trackers are present on 78% of the web traffic

That is more than the next 4 biggest trackers combined.

#trackerTopia #growth #topSites

26% of the web has a hidden Facebook tracking pixel

Facebook knows more than what you just do on Facebook

#facebook #trackingPixel #reach

490 companies track more than 0.1% of the web traffic each.

Which of these have you heard of?

#unknown #pervasive #mydata

Websites with the most (and least) tracking



out of 2189 top websites have more than 10 trackers per page.


of data per page load on average required by trackers

FINGERPRINTING is a unique digital signature derived from the properties of your device.

COOKIES are files placed by the website, stored in the browser that is used to identify you to the website.

The most common trackers