If there's one good thing about spy agencies...
.... is usually they aren't very willingly to share data, even among themselves - up to the point they miss clear evidences about some big crime about to be committed, for lack of cooperation.
So, in this regard Facebook, Google & C. are far worse - they'll sell you, maybe not everything, but enough, depending on how much they can earn.
Remember, here FB is furious because CA made money without sharing with Zuck... and sharing is caring... <G>