Interesting comments from Elisa and Dave in this post on RenoBaby. I was of course just trying to get more attention for myself, but found some testimonials to idea that the forum/medium has a lot to do with the kind, amount and source of interaction that you get.
Since all of us make recommendations to clients on what, when, why and how they should interact and post content, this seems like a valuable case study.
You know, actually, as I think about it ... it's not just that the forum was a comfortable place for me ... it's also that Reno Baby is a place I regularly check: twitter, facebook, myspae, renobaby. While I follow the other blogs (Jerz, Wolfy) in my reader ... (not NVblogs on twitter - sorry that's just TOO much) ... I check that after making the rounds of the others.
So for your clients ... I think you'd want to know the sites their customers all visit.