The NSA is just a juggernaut. Not only does it appear to be ignoring the rules that disallows following Americans unless they are interacting with foreign entities, they are forming all sorts of relations from the data. Not just “x talked to y” type of data, much more comprehensive than that. Who you hang out with, what professional affiliations the list goes on. And they are demanding more power, as there are “holes” in their data. Not just sure how much more they could, or should find out.