A recent study from Profound analyzing 30 million citations from ChatGPT, Google AI Overviews, and Perplexity between August 2024 and June 2025 reveals notable sourcing trends among these AI models. ChatGPT dominated with Wikipedia as its primary source at 47.9%. In contrast, Google AI Overviews ranked Reddit as its top source at 21%, followed by YouTube and Quora. Perplexity also heavily favored Reddit at 46.7%. The analysis highlights the significant role Reddit plays in the information landscape of these AI platforms, particularly for Google and Perplexity.
ChatGPT primarily utilizes Wikipedia as its top information source, while Google AI Overviews and Perplexity largely rely on Reddit, highlighting differing citation trends.
The study revealed significant differences in sourcing, where ChatGPT sourced 47.9% from Wikipedia, contrasting with Google AI Overviews and Perplexity, which relied on Reddit.
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