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

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And signal, for all its virtues, also leans heavily on contacts and phone numbers.
Yes; but at least it isn't going to then out a doctor's patients to one another. Still, security where people are at is best.
What is it about What's App that makes them hard to convert? I even got my elderly parents on Signal.
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