Leave a list of all the sites you upload your stories to (besides your personal site, if you have one) and whether or not you think they're worth using.
Wattpad: Yes, worth it, assuming you're writing in the right genre. My popularity goes up and down depending on what story I'm posting. Amber Silverblood is a werewolf story, so it gets tons of reads. The Gray Ranger or Juryokine are high fantasy, so they get way fewer.
RoyalRoadL: Not worth it. I've been uploading there for a couple years now, and I only have a small handful of views and feedback. I'll probably drop this site once I finish the stories I'm on now.
Fictionpress: Not worth it, but that may be a personal thing. I don't know what happened, but the site suddenly stopped working for me earlier this year. I would upload the chapter like usual, but when I posted it, it would come out all... code-y. Like this: https://www.fictionpress.com/s/3326078/5/Juryokine-Exile-of-Heroes. I haven't seen anyone else complaining about it, so like I said, it may just be me.
Deviantart: Not worth it. The options for uploading text are really limited (you can't even italicize) but I guess that's to be expected since it's a website built for visual arts like drawings. I had a few readers over the years, but they all eventually fell away.
One thing I'm curious about is Tumblr. Has anyone had any luck uploading serials there?