Sure. When you create the group, click on the option "Users must join to view the content" You may have to enable that option first in vboptions > social groups > allow join-to-view groups Also, there are a couple of usergroup options you must have set to no so the usergroup can't see the messages anyway (can always post messages and can always create discussions). Take a look at all the options under Usergroup > Social Groups to make sure.
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