If I may entertain an idea without necessarily believing it, I would not be surprised if many of the accounts on major social-media sites like Reddit, Twitter, etc are non-human persons tasked with pushing one narrative or another (no specific implication intended/assumed). The "subreddit simulator" powered by GPT-2 bots has more than enough realistic-seeming conversations to make me not immediately reject the idea, since we've all seen how much better GPT-3 is and I assume private entities have even better language models than that: https://old.reddit.com/r/SubSimulatorGPT2/
My additional total-speculation is that all the NSA/FVEY surveillance of our everyday online conversations and interactions would be an excellent training set for such a hypothetical language model.