How to forbid users to see and contact with each other?

I have 5 users on my NC. I don’t want they see each other and can contact with each other. But there’s a possibility in Talk and Sharing, where you can find local users. How to disable it and where? Thanks

I am also interested in a solution for this problem.

Use Settings -> Administration -> Sharing and change the first and/or second button.


@tostatas and @danonanon

searching the forum makes you wiser as this question was asked (and answered) several times before.
thanks to @devnull being so nice an investing time when you guys haven’t

am gonna close this thread.

PS: I know, tostatas, you have searched the forum, apparently… but apparently not well enough :wink: