An experiment with Perplexity's AI models found that 59.8% of the sources used to generate recommendations come from websites outside the top 100,000 most-visited sites. Many of these sources appear to be AI-generated content farms, with three sites producing 215,128 machine-generated pages. The experiment raises concerns about the reliability of AI-generated recommendations and the potential for manipulation. The findings suggest that AI models may be training on low-quality or misleading sources, which could impact the accuracy of their recommendations.