Which is the best way to allow a Pulse message related to a Case Type to be visible to a specific workgroup or a pre-defined list of users?

At the moment you have to set the post as Private and manually list every user you need, but it is not usable when you need to make it visible to a list containing tens or hundreds of users. Is there any way to select a list instead of each single user?

***Edited by Moderator: Pallavi to update platform capability tags***