The other day I asked Gemini to evaluate if a Reddit post was true. It told me it was definitely true because it had been verified by legitimate news agencies that had reported on the incident. These "legitimate" news agencies were an AI aggregator that just had a direct summary of the post with a disclaimer that it wasn't independently verified and a yahoo news "article" that was just the same AI summary. The AI summary included hallucinations that weren't even part of the original reddit post (like giving the OP a gender when no genders were mentioned).