Facebook recommends patients with a psychiatrist's number on phone friend one another—outing them to each other. 

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As for "use Signal". You can use Signal all you want. I do. Ordinary people—doctors' patients, lawyers' clients—are very hard to convert.
And signal, for all its virtues, also leans heavily on contacts and phone numbers.
I don't see WA and Apple security as holistic. Probably the result of huge budgets, and hiring the best. A Schizo accident
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