Thanks for this, Ben. Your article makes a good point that the enterprise has a built-in sense of community (we all work for the same entity). The interesting thing to study would be to test how much community members are likely to participate / contribute in wikis and other group-participation activities.
I tend to believe that having a community gives you (the enterprise) a jump start in the extraneous aspects required to achieve higher participation (trust, shared context, share needs ...).
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