"They wont get off so lightly moving forward"
Ahh.... bless... you really really believe that dont you?
If it had been less than the maximum amount (and I'm not sure the maximum amount has ever been applied in the past) you might have had a point. Although the ICO can do no more than what amounts, given FB's scale, to firing a warning shot it is nevertheless a warning shot. If FB has any wit they'll anticipate very big penalties under GDPR. And it'll be no help to them that they've managed to piss off Parliament by the snubbing them so your reflex cynicism might well be misleading you.