This: https://www.pbs.org/newshour/science/your-phone-metadata-is-more-revealing-than-you-think https://www.pbs.org/newshour/science/your-phone-metadata-is-...

This: https://www.pbs.org/newshour/science/your-phone-metadata-is-more-revealing-than-you-think https://www.pbs.org/newshour/science/your-phone-metadata-is-... Facebook, for example, can probably establish who my wife is, even if I don't explicitly put her in my profile, and who effectively are my affinity groups (friends/family/etc).