"Domestically, they're pulling together all the data about virtually every U.S. citizen in the country and assembling that information, building communities that you have relationships with, and knowledge about you; what your activities are; what you're doing."

A plot for a novel: NSA operative comes across an identity with no links to any other identity, no social network history. Just an isolated node... curious, she starts investigating and finds all avenues blocked, and her boss asks her to stop. Intrigued, Agent Hernandez continues on her own time...