How Tracking Pixels Work

How does Facebook know that you went to Old Navy?

It's increasingly common for data analysts and scientists to work with raw event data directly in their data warehouses, which is great—until recently these folks only had access to aggregated data which left them hamstrung. But I've found that very few of these analysts and scientists actually understand how cookies, javascript, and the HTTP request/response cycle operate. And without understanding what exactly is happening here this data can all feel rather mysterious and arbitrary.

If this sounds like you, this post will help fix that.


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