Something important to note is that this is being shared through Facebook's Pixel service.
Pixel is similar to Google Analytics, but Facebook is also more aggressive in forcing companies to use Pixel, and what's even worse is that any data shared with Pixel can be made available to other companies very quickly and easily.
From a marketing standpoint it's brilliant because it gives you the chance to see what other websites you may share audiences with and how to convert some of that.
From a privacy standpoint it's a nightmare, and the fact that the data you're entering onto a website is tracked by it and accessible is a huge problem that needs to (but won't) be addressed. I really wish that there wasn't such a large population of people who have just latched onto Facebook because they are a plague to privacy.
Source: Worked as a web developer for a marketing company for 2 years and had to do a lot of Facebook integrations.