How do they know why they're being requested?
So they're able to say if its for a fraud, murder, missing person investigation.
1) How do they (Yahoo!, Google, Apple etc) 'know' that it's really for the stated reason?
2) How are they able to say No, (as Facebook claimed) if they dont think it's a justified reason? If its got a court order.. Its got a court order.
3) What are the numbers for other national security agencies? How many times have GCHQ asked for data?
4) What about data for non-nationals? If the person isn't a US national, do the US laws apply? (equally to other countries).
So many unanswered, and likely weasle words still to come.