To tl;dr this breaking CJEU judgement for the non-wonks:
a) your site's FB Like buttons render you joint data controllers with FB, as you are transferring site visitors' personal data to them; therefore
B) FB pixels need prior active opt-in consent.https://t.co/vKxXj5Vkxd
— Heather Burns (@WebDevLaw) July 29, 2019