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How Signal Walks the Line Between Anarchism and Pragmatism
(www.wired.com)
This is a most excellent place for technology news and articles.
I guess you should know who you want to talk to, then have some other medium of contacting them, and then when you decide to move your conversations into a secure medium you meet or video call and pass the simplex key? That sounds about right. I suppose with the levels of privacy it espouses, there really can't be a form of "online communities" because people wouldn't want to reveal anything about them without already knowing the person they are revealing details to, and vice versa.