If you find that the default access rights in Novell Vibe Cloud are too open, you can limit access rights to messages and groups.
Section 9.1, Understanding Default Access Rights to Messages
Section 9.5, Limiting Users from Following You without Your Permission
Section 9.6, Limiting Users’ Ability to Send Messages Directly to You
Section 9.7, Limiting Users’ Ability to E-Mail Messages Directly to You
Section 9.8, Limiting Users’ Ability to Reply to E-Mail Notifications from Your Personal Feed