I feel like LLM models have had the opportunity to be trained on a sufficient amount of social media posts at this point that it's unlikely to matter.

I’m curious to see how things look, say, ten years from now. The way people use social networks, the language they use, even the memes they trade in changes over time. I can absolutely imagine an out of date AI giving themselves away by repeating todays equivalent of “rawr xD” to a future audience.