There's no need to jump straight to closing your account. There's a wide range of escalating actions you can take when companies dissatisfy you. Going straight to firing a company every time there's a problem doesn't really help.

Facebook absolutely cares how you feel when you use their service, because certain feelings are associated with less engagement (and thus less revenue) or people quitting the service. Expressing your dissatisfaction to them is a way to let them know that you're moving in that direction.