Stephen Downes describes the differences between groups and networks in this video on google. I found this on elearnspace.org:
http://www.elearnspace.org/blog/archives/002628.html
Stephen nails it perfectly: "Groups require unity, networks require diversity. Groups require coherence, networks require autonomy. Groups require privacy or segregation, networks require openness. Groups require focus of voice, networks require interaction."
This discussion has significance to knowledge management since groups and networks share information in very different ways.

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