I sent Mark a message yesterday on Signal. It was "delivered" but not "read", obviously. Today, I don't see that contact as a Signal user anymore. I see a "Invite to Signal" button on that conversation view. Guess he deleted the account?
I am curious, what did send to him? Also, do you often send messages to people you don't know via chat apps linked to phone numbers?
Haha, thanks for the chuckle.