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The encryption-system behind signal was developed by Matthew Rosenfield, aka, Moxie Marlinspike. He founded "Whisper Systems", which was purchased by Twitter. After that, Rosenfield left and founded "Open Whisper Systems" - which later renamed itself "Signal".

Jack has been promoting Signal - indicating that Jack Dorsey and Matthew Rosenfield continue to be closely connected. To reiterate, Rosenfield founded Signal. He remains at Signal.

(Another co-founder of signal: Brian Acton, who had come to Rosenfield from Facebook.)

The encryption-system behind signal was developed by Matthew Rosenfield, aka, Moxie Marlinspike. He founded "Whisper Systems", which was purchased by Twitter. After that, Rosenfield left and founded "Open Whisper Systems" - which later renamed itself "Signal". Jack has been promoting Signal - indicating that Jack Dorsey and Matthew Rosenfield continue to be closely connected. To reiterate, Rosenfield *founded* Signal. He remains *at Signal*. (Another co-founder of signal: Brian Acton, who had come to Rosenfield from *Facebook*.)

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Telegram also asks for a phone number up front and it has lots of fashy groups there unlike riot/element which only asks for username/email.