I thought the global intelligence services already had access to Facebook etc. data, maybe the question in-light of the Ed Snowden leaks, is why they didn't see

I thought the global intelligence services already had access to Facebook etc. data, maybe the question in-light of the Ed Snowden leaks, is why they didn't see this. Except, as commented there would be an extreme false-positive rate. In which case, why do we continue to fund the intelligence services...