On that privacy settings page we have:
People Who May...
 Start personal discussions with you:
And on Contact Details we have:
 Accept personal conversation invitations from...
These 2 settings are the same but have different labels. The official term now is "conversation"(?). The internal variable name is allow_send_personal_discussion.
Can we have only one term in use, to not confuse people, also for internal variable notations, phrase names and so on?