From internal leaks within the company as well as external analysis, the tip of the iceberg behind Facebook’s spyware empire is exposed. Take a look to better protect yourself when you’re not even on the platform: https://simplifiedprivacy.com/facebooks-corrupt-off-platform-surveillance/
It can link first by IP address, and then by fingerprinting.
Best to use unlock origin etc. to block all those little buttons. Don’t even connect to their server