Questions about Social Enterprise

Can anybody shares information about social enterprise? My friend is at a loss to begin a social enterprise. 

  1. Is it true that social enterprise is built on volunteer experts?
  2. Aren’t social enterprise is to give the marginalized job opportunities by earning profit from selling products or services?
  3. How do you tell a person is genuine to help as a partner?

She is confused and aching. And so do I.