I'm not sure incognito browsing actually helps much.
User tracking isn't a 100% accurate science, and your browser name, browser version, operating system, OS version, IP address, screen resolution, etc. are still getting sent along and they don't change by going incognito. It's no big deal for Facebook to just assume it's still you if the only thing that's changed is that you're no longer sending the same session cookie.
User tracking isn't a 100% accurate science, and your browser name, browser version, operating system, OS version, IP address, screen resolution, etc. are still getting sent along and they don't change by going incognito. It's no big deal for Facebook to just assume it's still you if the only thing that's changed is that you're no longer sending the same session cookie.