Fabricated and AI-Generated Viral Stories on r/AmItheAsshole and r/nosleep

Reddit's first-person narrative communities have long blurred the line between genuine accounts and fiction. r/AmItheAsshole (AITA) solicits real-life moral dilemmas and is widely treated as authentic — by ordinary readers, and by the news outlets and social-media accounts that repackage its posts as 'true stories.' Yet it is also widely understood to contain large volumes of fabricated 'creative writing' engineered to maximize engagement, with serial fabricators openly describing how they invented viral posts. r/nosleep operates under an explicit convention that every story is to be treated as true within the subreddit, a rule that makes its horror fiction immersive but also leaves its content especially prone to being mistaken for real experience once it escapes that framing.

The arrival of accessible large language models sharply worsened the problem. A 2024 analysis by Originality.AI, which ran an AI-detection model over text posts meeting a minimum length threshold, estimated that the share of AI-generated content in r/nosleep climbed from low single digits in 2020 to around 15% in 2023 and to roughly 41% of sampled posts in 2024. The same study found r/AmItheAsshole rising from negligible levels to around 12.5% in 2023, with a monthly peak near 30% in November of that year. The headline framing of the research was a roughly 174% increase in AI content across popular writing subreddits over the period studied.

These figures come with important caveats. AI-detection tools have inherent error margins and can misclassify both human and machine text, so the precise percentages should be read as estimates rather than exact counts. What is more robust is the direction and steepness of the trend, which the analysis found to be consistent across the sampled years and corroborated by the broader, widely reported phenomenon of LLM-generated text flooding storytelling and advice communities.

The stakes extend well beyond Reddit itself. Fabricated and AI-written AITA-style stories are routinely scraped into TikTok and YouTube narration videos, aggregated into clickbait articles, surfaced by search and AI summarizers, and in some cases fed back into datasets used to train AI systems. That creates a laundering pipeline: an invented or synthetic narrative can be re-presented as a 'real' viral news story and absorbed into the information ecosystem and into training data, degrading information quality far downstream from the original post.

The result is a slow erosion of trust in a category of content that depends on perceived authenticity. For r/nosleep the harm is mostly to the integrity of a fiction community whose appeal rests on the 'this really happened' frame; for AITA and similar advice subreddits the harm is sharper, because readers, journalists, and aggregators make real judgments — and sometimes real coverage — on the assumption that the dilemmas are genuine. The episode has become a frequently cited example of how generative AI is contaminating user-generated platforms, and of how poorly equipped those platforms are to label or filter synthetic narrative content at scale.