Yes we probably will, LazyGun - it's very opaque to the boundary between what is State and what is personal, an incredibly difficult judgemental call, I would postulate. That is what we may agree on - in terms of national security, I would hope and expect that there is surveillance going on, far beyond what we imagine, given reasonable expectations/suspicions - and that's why I don't use the word 'justified'.
On the other hand, I would not expect the FBI, MI5 or 6, CQS, PPS or anybody watching what you and I send each other on what JJ is wearing tonight - or not............
That is their dilemma, perhaps our dilemma too in what is acceptable and what isn't. The 'services' will always be on the back foot to some extent as 'what can they reasonably disclose' - and that is perhaps where Ed Snowden overstepped the mark. We are, unlikely, to ever know the truth, are we?