N.S.A. Gathers Data on Social Connections of U.S. Citizens – NYTimes.com
Phone and e-mail logs, for example, allow analysts to identify people’s friends and associates, detect where they were at a certain time, acquire clues to religious or political affiliations, and pick up sensitive information like regular calls to a psychiatrist’s office, late-night messages to an extramarital partner or exchanges with a fellow plotter.
“Metadata can be very revealing,” said Orin S. Kerr, a law professor at George Washington University. “Knowing things like the number someone just dialed or the location of the person’s cellphone is going to allow them to assemble a picture of what someone is up to. It’s the digital equivalent of tailing a suspect.”
[BN: TRAPWIRE adds facial recognition on closed-circuit security cameras]