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The forum effect: how Quora, Reddit, and niche communities shape AI search answers about your category

Reddit, Quora, and niche forums quietly decide what ChatGPT, Perplexity, and Google AI say about your product category. Here's what the citation data actually shows, and how to participate without getting banned.

Key takeaways: ## Key takeaways: - Reddit is the single most-cited social platform in AI search, but its share is volatile: ChatGPT's citations of Reddit collapsed from ~3.8% to under 1% in mid-August 2026, so never build a single-platform strategy. - On Reddit, popularity doesn't predict citability: 71% of posts cited by ChatGPT had fewer than 10 upvotes. A helpful reply in a quiet niche thread beats a viral post. - Quora works differently: cited answers average 37 replies and carry Quora's

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