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.