R/Nosleep is a digital publishing platform for horror literature. A unique quirk that defines this platform is the common understanding between its authors and readers that any story published to the platform is to be treated as a recollection of actual events. In other words, the fiction is to be treated as plausible non-fiction, both by those who write the texts and those who comment on them. This collaborative performance is enforced by a series of rules that authors and readers need to abide by. In this thesis I examine what exactly it is that authors and readers on r/Nosleep engage in when they treat the fiction as plausible. To do this I have conducted two analyses. First I have done analysises of three different stories posted to R/Nosleep, where I examine paratextual and narratological elements in each text to find if they either make a claim for authenticity or fictionality. And second I have analyzed the top comments for each of these stories to determine what sort of readings the users of r/Nosleep engage in and whether or not these readings play along with the rules established by the platform and its performance. From my analysises of the literature as well as the reader response I come to the conclusion that the seemingly strict rules enforced by R/Nosleep still leave a lot of wiggle room for authors and readers alike to engage in a rich variety of creative expressions both when it comes to writing and interacting with works of fiction.