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The new release of Signal has support for encrypting and sending arbitrary files. That's a very big deal: for many users it has long been an unsolved problem to securely share documents or recordings, and now it's as easy and sending a text. Update out now for Desktop, iOS, and Android!
And @rustyk5 is right: Signal audio and video calling is really great and usually seamless. I had an important hour-long audio call last week and I'd say Signal handled it better than a cell phone line would've.
@xor I definitely prefer it to anything else