I've wondered, and I think it might offer some pro's as the site expands, if it would make sense to have user-submitted tags. Say I come a cross this post tagged #music, but I find that #yacht-rock is also a good tag. I can tag the post with my own tag. These tags would be a separate category from the original tag, maybe even hidden by default, but it would share the submission with the legions of #yacht-rock followers who could be missing out. It could be tweaked that it only overlaps with my followers perhaps? I'm not sure. The next best thing would be to "network" tags somehow. When I follow #music, I default to following all the genre tags. However I can expand the music tag "network" and add/remove the tags as I see fit. However this would require continual development on your part. The previous suggestion is basically the same except the users do the work and it's more dynamic.