https://ricochet.im/ is the only chat app that provides some solid privacy (or at least try). There are others like tor messenger, but they are not ready yet.
Signal is “ok” but still you have metadata. One metadata is enough to build a complete profile (from the phone number you can get the FB account, gov can get your position, from your IP your get your FAI, etc…).
Think about it, twitter has your phone number on your twitter profile. Even if you didn’t provide it, they know your IP. So you have to trust Signal and Twitter.
I think telling peoples signal is safe in comparison to whatsapp is dangerous. You better told them there is no working system yet.
Imagine that peoples trust your advice, use signal for communicating sensitive information and get jailed or killed. You have this responsibility now.
