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The way I see this forming is sort of a community-run "suggestions to follow" - so a list of popular, generic topics (news, politics, economics, technology, arts and culture etc) and under each category a few users and possibly a domain or two suggested by the users of hubski as a good place to start. Basically, a "if you are interested in x, try following a, b, or c as they regularly post that content". I guess when I phrase it like that it sounds a lot like the tag system already, though.