That's why I deleted my actual Facebook account, it really did give me the impression that the company was Cyberstalking me. They knew stuff I did not tell them or put down anywhere in any of the data forms they gave me to fill out. I didn't upload any pictures, I barely did much of anything, yet somehow they seemed to know everything about me anyway.
I eventually made a new "account" a few years later and left it completely blank and filled out nothing but my name... and yet they still guessed quite a few things correctly, including who I knew in real life. So damn creepy. I only use that new account for log in synchronization for games and apps that don't have any other means of access. I wish I could get rid of it too, but it's a necessary evil for certain edge cases.
It doesn't matter if you post anything to Facebook, or if you even have Facebook account. Almost every commercial site in the world has a "Share this" button somewhere that is loaded directly from Facebook. IF you have a Facebook cookie, your information across the Internet is collected. IF you block Facebook cookies, but use somewhat static IP, you are still monitored.
Google and every other company that lives by datamining users for advertising purposes tries tier best to do the same. Aggressive adblocking in your browser helps a bit, at least you can tell your browser to not send the request, but it's VERY HARD to stay outside the data collection from these companies and adblockers are a constantly escalating war of attrition.
The End Boss isn't Meta, Google or Twitter.
It is advertising networks and the entire advertising industry.
