Exactly the damn problem with all this "Social Media" BS, sometimes conversations are clearly meant to be private between the principals. Remember when eavesdropping was considered to be rude and impolite, maybe wouldn't be a bad idea to go back there.
The fact we now CAN do it, doesn't mean we automatically SHOULD. When WE feel disrespected, WE can choose how to deal with it, preferable without a worldwide audience listening in.