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I'm a pretty new user here. I think the system as a whole is excellent, at least I prefer it to reddit, hacker news, slashdot, or anything similar.
I mostly just follow tags, but occasionally notice a user who consistently posts really interesting stuff. I like the flexibility of it, especially combined with the self moderator functions. Hubski feels more personalized and tailored to me than other sites. The other benefit of following users instead of just tags is you get exposed to other tags that you may not have otherwise seen (although multiple tags per post helps with this as well).