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I do believe Hubski would scale better too, but I also enjoy reading from specific tags too. I mostly follow people, but I also follow a few tags. If I only followed users, you're right, my feed probably wouldn't change that much. But while my content in my feed might remain strong, the comments in those sections might get notably worse if people I dislike are following the same people. Also, browsing the global feeds to find new people to follow, or see more general content outside of my personal feed, could easily become a flood of constant crap with lots of junk to sift through.