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I don't think that's really an issue you should be addressing. You've already fundamentally shifted the paradigm from a tag-centric browsing to a person-centric browsing. Heterogeneity of opinion comes with following people with a variety of opinions. And the freedom to curate your own content according to your own ideas about what/who is appropriate for you is much more powerful and welcome than the heavy-handed "heterogeneity is important"