third-party-web/lib/markdown/updates/2019-03-01.md

Categorized data on third party entities on the web.

Almost 2,000 entities tracked now across ~3,000+ domains! Huge props to [@simonhearne](https://twitter.com/simonhearne) for making this massive increase possible. Tag Managers have now been split out into their own category since they represented such a large percentage of the "Mixed / Other" category.