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Operating systems such as Linux, and Mac OS, (and Windows 10???) have a notion of groups to manage collaboration of the users of the system.

Check the groups of a user

 groups username

Add an Existing User Account to a Group

 usermod -a -G group username

Create a new group

 sudo groupadd mynewgroup

Change the group of a file/folder

 chgrp group fileorfolder

To change the group of a folder and all its contents, use the -R (recursive) option:

 chgrp -R group folder

For even more social/sharable folders, see ACL.