In fact, the metadata revealed quite a lot. Even deeply private details such as chronic health problems, religious affiliations, and drug use emerged by simply linking people to various clinics, stores, and organizations through their call records.
Your call and text records are far more revealing than you think
The sensitivity of phone metadata is "common knowledge in the security and privacy communities," Mutchler says. The goal of the study was to "put hard data behind these hunches.
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In an attempt to limit the scope of phone metadata surveillance, NSA is purportedly following a "two-hop" rule: For any given person of interest, metadata can only be harvested from people called by that person, and then also people called by them. But the study found that a large proportion of their subjects were connected to each other not through personal relationships but through customer service lines, telemarketers, and two-factor authentication services such as those used by Google.
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Even with a two-hop limitation, an NSA analyst could in principle "hop" to an additional 25, people from any one individual. How to contact the news team.
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Stellar eruption sent gas flying at record speeds Aug. Lab-grown lungs transplanted into pigs Aug. In a statement, a Facebook spokesperson explained why contacts were uploaded. People can delete previously uploaded information at any time and can find all the information available to them in their account and activity log from our Download Your Information tool.
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Facebook asks users for permission to upload this sort of personal data for a number of reasons: Messenger for Android asks for permissions to read call and SMS logs for a similar purpose. The company notes that users can stop continuously uploading contacts and delete all their previously uploaded contacts by turning off the continuous uploading setting in the Messenger app.
Permanently deleting a Facebook account will also result in contacts no longer being uploaded and all previously uploaded contacts being deleted.
March 23, Ben Wigham bmdwigham I had a similar issue with mine on Android. March 25, In a statement, a Facebook spokesperson explained why contacts were uploaded. What are the Cambridge Analytica files?
Facebook may be keeping tabs on your phone call and message logs
Alexander Nix blames 'global liberal media' for Cambridge Analytica collapse — as it happened. India to investigate alleged Cambridge Analytica data breach. Inquiry to determine if data of Indian voters and Facebook users was compromised.