Simple BuddyPress Privacy is a plugin that allows BuddyPress users to choose exactly who can see their profile page. They can choose display it to all (public), logged in members, friends only or just themselves.
LH Logged In Post Status is a WordPress plugin that adds a new post status of “Logged In” to the available status options in the Publish dialogue box. What this means is that posts can be published only to logged in users, which is an option that would enhance the privacy options available for post content.
BuddyPress Members Only is a BuddyPress plugin that will redirect any attempt to access your sites pages from none logged in users to the register page thus enforcing a completely private network.
BP Registration Options is a simple plugin designed to do two things: It enables moderation of new BuddyPress users, and it turns a BuddyPress site into a private network.
Simple BuddyPress Profile Privacy is a plugin that allows site members to choose who can see all aspects on their profile as well as giving them an option to hide themselves from the members directory.