The problem with creating a Facebook account is that you have to agree to their ToS & privacy policy and thus give them legal permission ("consent" in GDPR terms) to stalk you in every way possible and they are very good at that (in fact they already have a "shadow profile" on you, but as long as you haven't agreed to the terms they are doing so in breach of the law).

If you really want to use a throwaway account and have a chance to escape their surveillance engine, use it on a separate machine, VPN'd to a separate network (where none of your real traffic ends up) and do not do anything on that machine that can be correlated to your real activity (no playing with friends for example).