Fly in the ointment time! I like the idea of greater customization potential, but I'm a little worried about echo chamber effect with this one. Isn't the point of tags to allow for a greater breadth of opinions/content? I like following, say, the "music" tag because it's so vague and untargeted- if I have the option to filter out people with perceived taste differences, I risk overlooking good stuff I would've otherwise missed. Correspondingly, if I like somebody's taste in anything, I'm already following them personally and so I'll see their submission re. any given subject on my main feed. Doesn't this potentially just create redundancies?

Also: sometimes I follow somebody because I like their taste in music, but it turns out I'm not so hot on their politics. But I like the idea of taking that person as the whole bundle for better or worse, and in so doing having to reconsider their positions on various topics just by virtue of connecting with them on other levels. If I can pick and choose which aspects of a user to follow, kind of saps some of the humanity out of the experience.

And on a more self-involved level (if there was any other level to begin with?)- I like to think that I have something to add to some tags. I'm also much more likely to post to those tags over others. If I'm being filtered out of my favorite tags, and it starts to feel like I'm just shooting submissions into the void, doesn't that create a disincentive to post anything at all?