what you're describing is pretty standard operating procedure in digital maketing, minus unique IP address (which isn't uncommon, just ain't *standard*). All those cheesy personality tests, and who do you look like quizzes, and what films do you like...FB keeps all that info, builds identity profiles and sells it to people, 24/7. ALL online data companies do.

All well run FB custom audience campaigns do everything you described. Those are standard targeting settings for a FB campaign.

And MULTIPLE third party companies data mine and cross reference cookies to build very detailed user profiles. That's an entire industry, bruh.

So, no.
There isn't a story, here.