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Re:Ask HN: How do we know Signal or Telegram don't store our... by fuzzylightbulb on Wednesday January 13, 2021 @12:03PM (#25764835)
https://www.sciencemag.org/news/2016/05/your-call-and-text-r...

Metadata can be as damning as the actual message data, and in a lot of places you don't want the authorities to know that you are even communicating at all.

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