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Reminds me of this RadioLab episode about a company that loiters over areas with a high resolution imaging platform that allows them to 'rewind' from the scene of a crime to see where the suspects came from:

https://radiolab.org/episodes/update-eye-sky

The company in question:

https://www.pss-1.com/

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If you're looking for more info, there is a whole book that goes beyond the content of this episode. I found it to be an informative, and eye-opening (albeit disconcerting) read.

https://www.amazon.com/Eyes-Sky-Secret-Gorgon-Stare-ebook/dp...

It also made me think of this: https://www.bbc.co.uk/news/science-environment-20629671

All of these are good illustrations of the idea that by putting multiple data sources together, even "anonymous" data sets can be de-anonymized surprisingly easily.

I'm working on a project to study Reddit data to see how many users have unique footprints. I'm only looking at the subreddits where people participate. If you participate in at least five subs, you're probably the only person with that unique combination of subreddits.

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