Hm. As an artist, I find plenty of other artists to follow or use the tag system to keep up with fandoms (or fandom warring as it happens to be for a lot of things I enjoy).
While I've been tracking #weblit , #webfiction #serials, admittedly nothing ever shows up exception when Webfiction World posts links to podcasts or readings.
#lightnovels: Yields mostly discussion on "Sword Art Online" which itself was a serial online in Japan before it became a light novel and anime and then ate the brains of anime fandom.
#prose : Highly popular tag for posting drabbles and short 300=500 word essays. I may use this from time to time, but it's scattershot.
#flashfiction: Decent activity, but hard for me to grasp a feeling for the people who write under this tag. I often need more of a sample to decide whether to read more from that person or follow them.
I wonder if there are other tags I ought to be looking at, but then Tumblr starts to drive me crazy after a while because the artists often spam my feed with lots of reblogs and such x(