Two-mode core-periphery analysis The "core" is a cluster of frequently co-occurring actors and events. The "periphery" consists of a partition of actors who are not co-incident to the same events. 0 means bad fit, 1 means excellent fit. Ideal density matrix
Two-mode factions analysis Factions are groupings that have high density within the group, and low density of ties between groups. Example
Recommended paper The Quest for Content: How User-Generated Links Can Facilitate Online Exploration JACOB GOLDENBERG, GAL OESTREICHER-SINGER, and SHACHAR REICHMAN JMR, 2012
Is social network important to e-business?
product pages linked by hyperlinks & user generated links
conclusion This dual-network structure in facilitating content exploration.