Medium does categorization, but upside-down. Instead of adding a category to a post, you add a post to a category. http://9o.r2.ly/
@eggandburger --It could be an n-level hierarchy or two-levels. Not sure yet, since I can't create new categories.
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@eggandburger --It could be an n-level hierarchy or two-levels. Not sure yet, since I can't create new categories.