The base for it is already done with Insight, is just an issue to find the human resources that can get involve in this and create a SN group. Marketing is a general team that has to handle not only about spreading and SN, but also about websites image, marketing items and many more.
Maria your idea looks interesting.
I agree with you that the major problem would be finding an audience.
I think we can and should run a blog like omgubuntu.
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