Why is metadata surveillance dangerous?

A small academic study showed why pure metadata surveillance is dangerous to privacy and liberty.

Participant A communicated with multiple local neurology groups, a specialty pharmacy, a rare condition management service, and a hotline for a pharmaceutical used solely to treat relapsing multiple sclerosis.

There were several others that were similarly dramatic.  And this was a study of almost 550 people over a couple of months.  Scary stuff.

If anyone tries to reassure you that the NSA's PRISM program "is just metadata", point them at this.

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