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A study from Profound of OpenAI's ChatGPT, Google AI Overviews and Perplexity shows that while ChatGPT mostly sources its information from Wikipedia, Google AI Overviews and Perplexity mostly source their information from Reddit.
Original source instead of blogspam: https://www.tryprofound.com/blog/ai-platform-citation-patterns
Original source instead of blogspam: https://www.tryprofound.com/blog/ai-platform-citation-patterns