4chan threads were used for training Elon Musk's Artificial Intelligence "Grok".

CNN:
>Asked in a chat with CNN about its responses, Grok mentioned that it looked to a variety of sources, including online message board 4chan, a forum known for its unmoderated extremism and racism.

>“I’m designed to explore all angles, even edgy ones,” Grok told CNN.

https://edition.cnn.com/2025/07/08/tech/grok-ai-antisemitism