Does FB track by IP or cookie or both? I use different browsers for the more invasive tracking sites. For FB (which I use very sparingly these days to stay in touch with people I won't hear about in other circles) I currently use Safari. I log in and out and limit my use of that browser to FB and a handful of other sites.

since Chrome is such a memory hog on macs my principal browsers are opera and brave, both of which work very well on my elderly macbook air.

I have no idea if my somewhat paranoid tracking avoidance is effective against FB though. I see that when I go to the log in page in safari that FB knows how many 'posts' I have stacked up to consume (the little Pavlov's dog red circle with a number in it). I'm assuming I'm being tracked despite being logged out...