Reddit is using large language models to combat spam created by large language models, the company disclosed in a blog post. The platform now blocks 23 million spam views per day and catches approximately 25,000 new spam posts and comments daily.
Reddit says LLM-powered detection catches "highly subtle, coordinated patterns of fake behavior and artificial hype that older systems once missed." User exposure to spam dropped 20% from January to March compared with the prior three months. TikTok now lets users toggle how much AI-generated content appears in their feeds, reflecting a broader industry shift toward algorithmic disclosure.
Analysis
The same technology flooding platforms with synthetic content is now the only thing that can filter it at scale. But LLM-based moderation creates a detection arms race: as models improve, so does the spam they generate. Reddit's 20% reduction is real progress, but the ceiling on fully automated moderation is hard, and human reviewers remain essential.
