"The Art of Community: Building the New Age of Participation" (2012) https://g.co/kgs/P2V1kn

"Tribes: We need you to lead us" (2011) https://g.co/kgs/T8jaFS

The 1% 'rule' https://en.wikipedia.org/wiki/1%25_rule_(Internet_culture) :

> In Internet culture, the 1% rule is a rule of thumb pertaining to participation in an internet community, stating that only 1% of the users of a website add content, while the other 99% of the participants only lurk. Variants include the 1–9–90 rule (sometimes 90–9–1 principle or the 89:10:1 ratio),[1] which states that in a collaborative website such as a wiki, 90% of the participants of a community only consume content, 9% of the participants change or update content, and 1% of the participants add content.

... Relevant metrics:

- Marginal cost of service https://en.wikipedia.org/wiki/Marginal_cost

- Customer acquisition cost: https://en.wikipedia.org/wiki/Customer_acquisition_cost

- [Quantifiable and non-quantifiable] Customer Lifetime Value: https://en.wikipedia.org/wiki/Customer_lifetime_value

Last words of the almost-cliche community organizer surrounded by dormant accounts: "Network effects will result in sufficient (grant) funding"

Business model examples that may be useful for building and supporting sustainable communities with clear Missions, Objectives, and Criteria for Success: https://gist.github.com/ndarville/4295324