This group, though it is not limited in users, is suitable for an organic setting like close friends, family, small work crews etc.
Every user can send a message to all participants and most important – every user can choose which subject-related messaging they will receive.
For example: A small start-up company can open subjects like “Development”, “QA”, “Lunch”, “Marketing Lectures” etc. Each user can choose the content that is interesting or relevant to them and participate in those groups only.
The Group is private. Hidden in search engines. Joining by invitation only.