What is the purpose of a community for its creator?

A community can gather citizens sharing the same interest, professionals looking for mutual help but also beta testers of a mobile application.
The reasons for founding a community thus vary according to the needs of its creator. When you decide to create a community, first ask yourself: why? Example Why group these users in a Facebook group?
A community is also used to be identified as a reference actor in a field of activity. Concerning self-help communities, the administrators of these communities become identifiable and influential personalities within a Facebook group.