d238a290_n__Communities___Collaboration__Sociability_Concerns
[User Questions] 8. Why should I come back? [Usability Concerns] How often and by what method should content be changed (e.g. news, broadcast, provocateur to stimulate discussion, etc.)? [Sociability Concerns] 
What will entice people to return on a regular basis?
CoP Usability and Sociability Heuristics | Curation, Communities & Collaboration
Sociability Concerns