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Does it advertise your username? If I don't have the name of the contact, will Signal share my username or does it just say "this number in your list has joined signal, and here is their profile?"

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My understanding is that your profile username is made visible if:

- the person is in your own contact list

- you create a conversation with them

- you accept a conversation from them

see: https://support.signal.org/hc/en-us/articles/360007459591

Nice. Sounds like the same rules apply to profile pictures as well. That feels like a step in the right direction, but it still means that by having family/coworkers/college buddies/etc in your contacts, they can see your profile picture and username. I know this can be a sticking point for some. It would be great if Signal introduced finer-grained privacy controls so it could appeal to an even wider audience.

You can download leaked phone numbers of millions of ppl and add them to your phone's address book (iOS limits contacts to 50k). I don't think this is very secure.

No, that would only allow them to see your name, but you still wouldn't see their names unless they add you.

You also see people's username when they are in the same group conversation as them (and they are not in your contact list).

That's what I observe by using Axolotl on the phone and Signal Desktop on the computer.

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