There are a number of possible interpretations as to what thety are doing and some interpretation of what we have seen and read regarding the NSA data collection probably exists that would probably make most of us pretty happy.
The problems are: (a) we dont know what they are actually doing and (b) we cannot trust them not to lie to us about what they are doing, one way or another.
The other problem is that the NSA has made it clear that in its opinion collecting metadata on a call is fine at any time, for anyone/everyone.
Metadata on a cell phone clearly includes time and location of cellphone/receiver checkins.
It is absolutely reasonable to assume that, if they want, the NSA can track the location of any person carrying a cellphone; or - given that they are storing this data - reach into the past and know exactly where you were, and when.
that is a remarkable power, IMO.
Hook that data up to a computer display and holy cow, that is a powerful tool.
Frankly, it would be awesome. if it wasn't for the fact that you, specifically and personally, appear on that display.