One major irony here is that law, which always lags behind technological innovation by at least a generation, gives substantially more protections to a communication’s content than to its metadata—and yet intelligence agencies are far more interested in the metadata—the activity records that allow them both the “big picture” ability to analyze data at scale, and the “little picture” ability to make perfect maps, chronologies, and associative synopses of an individual person’s life, from which they presume to extrapolate predictions of behavior. In sum, metadata can tell your surveillant
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