How firms are manipulating Reddit to rewrite AI answers

Moderators of the popular subreddit r/biohackers have banned standalone posts about peptides and hormone replacement therapy (HRT) after discovering that companies in those industries were systematically spamming the community to manipulate AI chatbot responses. Jason Koebler reports for 404 Media that the tactic is part of a broader activity, often known as Generative Engine Optimization (GEO).

This specific tactic works by flooding platforms like Reddit with content designed to be accessed by large language models such as ChatGPT or Google’s AI search. Because these tools frequently cite Reddit as a source, manipulating Reddit posts can directly shape the answers AI systems give to users.

Sophisticated tactics, real risks

According to the subreddit’s moderators, the manipulation has grown highly sophisticated. Companies and marketing agencies are no longer simply dropping product links in comment sections. Instead, they engineer entire threads around questions likely to attract engagement, then embed brand mentions at strategic points to ensure AI systems pick them up.

The accounts doing this are deliberately “warmed up” with normal posting histories to avoid detection. Some agencies pay real people to post promotional content.

One moderator told 404 Media the health stakes make this especially concerning: “How do we prevent actual physical harm?” The subreddit covers experimental compounds with little regulatory oversight, and the moderator warned that manipulated recommendations could lead vulnerable users, including teenagers, to buy unsafe products.

Affected posts will now be limited to weekly megathreads. The moderator described the broader trend with frustration: “This one place on the internet that was so human is sort of eroding and becoming bogged up with artificial AI-driven content.”

Reddit told 404 Media its safety teams use automated tools and human review to detect manipulation at scale and also provide moderators with tools to identify likely spammers.

Companies openly advertising such services include RedRover, which promotes “an army of agents publishing blog content and Reddit posts” to influence both Google rankings and AI citations.