user notes, user create topic

User Notes – Allow users to create public and private notes from their profile. wondering if admin have full control to allow users create message in public or private as admin do not want private conversation go on between users, and also admin not allow users to delete any conversation.

Besides, instead of create notes in user profile, can user create topic instead and let other users communicate regarding this topic (rather than on their profile), if possible to allow “message” button not on user profile but next to “topic section”.