Private profiles allow you to manage who can see your posts. You do not need a private profile in order to manage who can message you, as all messages from users you do not follow appear as message requests.​
Conversely, private profiles that you do not follow will not display any information except for the name, biography, avatar and follower/following counts. It is not possible to view the followers/following of a private account you do not follow.
Following a Private Profile
When requesting to follow a private profile, the user will be notified of your follow request.​
If the user accepts your follow request, you will be notified in your activity. If they ignore your request, you will not receive any notification.
Switching to a Private Profile
To switch to a private profile:
When viewing your own profile, select the Set Profile to Private item under the settings