[jjh42]

It's a good start for a response, especially since it has the CEO's imprimatur on it.

However with all the shady definitions the NSA is using (e.g I can imagine some weasel claiming user data is only the content not the metadata) I would have liked an explicit example.

Something like, "For example, when one gmail user emails another gmail user the government is not, for the majority of users who are not the subject of a specific government order, made aware of this in any way including the contents of the email, metadata and even that an email was sent. Obviously, we have no control over emails, sent outside our network."