Signal by @whispersystems is all about privacy, but when you join it notifies all your contacts w/o telling you. Deleted.
It doesn't, maybe he means that existing Signal users who already know his number see that they can contact him by Signal instead of SMS.
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Yeah I dunno guys. Got a msg from a friend saying they got a notification I just signed up. Felt creepy. Deleted the app.
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We want private communication to be simple. Anyone who already knows how to contact you via SMS can contact you securely on Signal...
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...and the service has been designed so that it doesn't store any record of your social graph.
End of conversation
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