It was the NSA =Qs group
Just a thought that the reason that FB wont say is that its from inside the US and if they say who they think did it an investigation would start…or maybe that is why the breach took place, to start an investigation. Good guys cannot use it since they grabbed it in a hack, but FB knows what it is and this was a setup to get the ball rolling. FB is Mum, hiding what the data was and who has it…kind of curious dont you think?