[slotrans]

1. customer enters their address in form fields

2. those form field values are templated into a GET request to the Meta tracking pixel (or POST request to the /events endpoint, or ...)

3. profit

they've made it very easy https://developers.facebook.com/docs/meta-pixel/implementati...

[rahimnathwani]

OK, based on your link the answer to my question seems to be: it's not a tracking pixel, but the "Meta Pixel", which the documentation describes as "a snippet of JavaScript code".

[jameshart]

Welcome to the wonderful world of affiliate marketing, adtech, and tag management.

In that world, third party ‘tags’ that are included in a page are generally referred to as ‘pixels’. Sometimes they are single pixel img tags. Frequently they are scripts. But the industry calls them ‘pixels’ anyway.

It is, surprisingly, not a terribly honest industry.

[slotrans]

it could have been much worse, I have seen passwords leaked this way

("seen" meaning "I worked at a company where this happened and read the code with my own eyes" not just "I read it in the newspaper")