Mumsnet denies using AI for content after prompt appears on message board
Mumsnet has denied using AI to write forum threads or replies after a detailed AI instruction prompt appeared in response to a user seeking advice. The incident unsettled members and raised questions about how the site uses AI and whether its explanations were transparent.
The prompt, which defined Mumsnet abbreviations and instructed an AI to produce a forum-style judgement and advice, appeared in a discussion about a neurodivergent uncle and a sick child. Founder Justine Roberts said users’ drafts are sent to OpenAI to suggest thread titles, and that an error produced the reply-writing prompt; she said Mumsnet does not use AI to draft posts. The site says it uses AI for coding, advertising operations, conversational analysis and flagging posts for moderators; in 2025 its monthly unique users fell 19% to 6.1 million, to 6.1 million, while posts dropped by 600,000.
- An AI reply-writing prompt appeared on a Mumsnet thread.
- Founder Justine Roberts said it was an error in the title tool.
- Users remain unconvinced by the site’s explanation.
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Mumsnet is a large internet forum where millions of users, mostly parents, seek and offer advice on everyday problems from childcare to relationships and household issues. It has been operating for over two decades and has built its reputation on advice from real people sharing genuine experience, which is what draws people to use it.
An AI instruction prompt recently appeared publicly on the site in response to a user's question, raising alarms among members about the site's use of artificial intelligence. The prompt revealed detailed instructions for how an AI should respond in Mumsnet's characteristic style, including guidance on its abbreviations and tone, prompting questions about what role AI plays in the forum's content.
The incident has highlighted questions about how established online forums use artificial intelligence and the importance of transparency with users about these systems. For a forum where people seek advice on personal matters, whether responses come from real members or are generated by AI is a key distinction that affects how users assess the reliability and value of what they read.
Both sides, in good faith
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The case for
Mumsnet’s explanation is that AI is used for limited operational tasks, including suggesting titles, while members’ actual threads and replies remain their own. Sending draft text to OpenAI for title suggestions may be a practical way to improve usability, and the prompt appearing publicly could have been a technical error rather than evidence of routine AI-written posts.
The case against
Members can reasonably question whether the explanation is complete, since a detailed prompt for writing forum-style replies appeared in a live discussion and the site acknowledged using AI across several functions. Even if posts are not routinely AI-generated, sending drafts to an external AI service raises questions about transparency, privacy and how clearly users are told what happens to their content.