Appspace Intranet (Powered by Beezy) allows community (and stand-alone tools) creators to set up three types of privacy:
Public: Everyone can access content, provide feedback (i.e. comment and like) and join the community.
Moderated: Everyone can access content but need to request membership in order to contribute.
Restricted: Only users invited by owners can access and contribute. This type can be completely hidden (meaning it will not appear in the search or any listings), or discoverable.
For information protection, the community owner cannot convert a restricted community into a public one.