Is it possible to add a user to an ArcGIS Online organization without giving them access to everything that's shared within that organization?
I'm thinking about contractors from other (small) organizations that do not have their own ArcGIS account, and only need temporary access to a limited set of data.
UPDATE: That user should have read or write access to certain selected elements only, let's say one WebMap. Everything else should be hidden, including items that are shared company wide.