Thank you to those who were able to join in on the discussions at SoTEL. Here are two references that informed my distinction between CoPs and networks:
Jones, C. (2004). Networks and learning: communities, practices and the metaphor of networks. Research in Learning Technology, 12(1), 81–93.
Wenger, E., Trayner, B., & De Laat, M. (2011). Promoting and assessing value creation in communities and networks: a conceptual framework. Centrum (Vol. 18).