@RichFelker no it doesn't. It only tells people who already have your number that you're now on signal.
I've seen a lot of back and forth on this and it's not clear to me which is correct. Seems to be some evidence of indirect leak.
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All that happens is if you register on signal, anyone with YOUR number gets notified that you registered with signal. Thats it
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Any "leaks" of numbers into contact lists isn't signals doing. I'd be looking at facebook/google/etc "finding" contacts numbers
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Putting your phone number into any social media sites means it can leak via those.
End of conversation
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