IMHO; Even in face to face confrontations (I call it that), no one should answer highly personal and intrusive questions by a stranger, especially if unsolicited. A decent person, if they have a serious proposal of a prospective shidduch, will approach the interested parties in a discreet manner and will solicit information that is of a general nature and not highly personal. Someone who is by nature a gossip and will label themselves “Shadchan” just for the purpose of eliciting information and spilling it all over the neighborhood will lose their credibility very fast.
