What role do Reddit and forum content play in AI model training?

Reddit and forum content moved from background noise to mainstream AI source over the last two years. The engines now cite Reddit threads, Hacker News discussions, Stack Exchange answers, and platform-specific forums (Glassdoor, Blind, niche subreddits) for any query that has an evaluative or comparative dimension: ‘what is it like to work at X,’ ‘is Y a good service,’ ‘how does Z compare to its competitors.’ The implication for a brand is that what people say about it in those communities is now infrastructure-grade signal, not optional sentiment. A reputation program ignoring Reddit, Glassdoor, and the relevant niche forums is leaving one of the most influential source categories unmanaged, and the engines will show whatever is there with confidence.