No email or text is especially secure, so using this form of communication with someone on a different provider doesn’t expose a person to any unexpected risk. But messaging programs vary wildly in what they expose and how they handle data. Anyone using such a network would have only as much privacy as that provided by the least private service, which is currently nothing. That’s the opposite of what I would want out of a communication software, personally.

I think if you were using a very secure messenger, and talking to someone using a very insecure messenger, that could be a problem.

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Same. I was like, wow, that’s really bad behavior while camping.