The results reveal just how rich a seam of information your metadata is. The participants gave up their phone’s metadata via a special app, along with publicly available information from their Facebook profile. Then, the researchers set to work, digging through it all to find out as much as they could.
So, one participant in the study “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”; another “had a long, early morning call with her sister. Two days later, she placed a series of calls to the local Planned Parenthood location. She placed brief additional calls two weeks later, and made a final call a month after.”

Surprise: Phone Metadata Gives Away the Most Secret of Your Secrets | Gizmodo UK

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