Human_Gravy here! I've been around for a long long time and have pretty much-done everything. I've modded NoSleep and I'm currently a mod for /r/ShortScaryStories and /r/NoSleepTeams which is a bi-monthly collaborative/competitive writing sub where you can work with some of your favorite authors to create stories. I've been a part of several of the collaborations on NoSleep including "All in Good Time" a.k.a. Alan Goodtime, "The Sniffles" event, and most recently the /r/AlphabetStew collection (H is for Hegemonic).
I've also put together my own collaboration anthology featuring authors from both /r/NoSleep and /r/ShortScaryStories called Horror d'Ouevres - Bite-Sized Tales of Terror which is a charity book in which all the proceeds from royalties are donated to a popular horror charity called Scares That Care which helps families in financial need to due the real life monsters of cancer, severe burns, and childhood illnesses. It's raised nearly $1000 so far for the charity and there are two more volumes currenlty being worked on.
Subreddit: /r/Human_Gravy