> Preserving a (possibly revolving) core group of people (20% of the userbase generates 80% of the activity) very true but 100% of the userbase will consume 10

> Preserving a (possibly revolving) core group of people (20% of the userbase generates 80% of the activity) very true but 100% of the userbase will consume 100% of the activity, extreme numbers but point being that whilst only 20% are creating content a greater share, assume everyone, will consume it. In the UK there is a community called mumsnet - I know so many people (including me) who consume from it but do not generate back.