Online tracking: A 1-million-site measurement and analysis is the largest and most detailed measurement of online tracking to date. We measure stateful (cookie-based) and stateless (fingerprinting-based) tracking, the effect of browser privacy tools, and "cookie syncing".

This measurement is made possible by our web measurement tool OpenWPM, a mature platform that enables fully automated web crawls using a full-fledged and instrumented browser.

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Sites with audio fingerprinting scripts.

In a crawl conducted during March 2016, these websites were found to run scripts on their homepages which contains audio fingerprinting code. Sites which contain scripts are not actively using the technique. Sites which contain scripts only perform a check for the existence of AudioContext, and add that bit of information to a fingerprint.