Obviously FB has nobody on their "side" but themselves, but I for damn sure am not on the UK government's side here. Comes off as look-what-we-can-do strong-arm tactics when you don't show up when they want you to. And the publishing appears to be just gloating. Shameful and I would hope others see it this way regardless of their feelings towards FB. Sadly, the less-principled masses care more about who it's targeted towards than the actions.
I wonder if the CA judge will formally censure the UK government or encourage others with sealed documents in hand to not travel to places like this. Cry "exceptional circumstances" all you want, but we declare non-guilt on harsher crimes for much less egregious discovery violations than this.