I'm pretty sure that before the era of LLM, hired personnel and computer chatbots already exists on major social media platform to serve as "opinion influencers

I'm pretty sure that before the era of LLM, hired personnel and computer chatbots already exists on major social media platform to serve as "opinion influencers", either for political or commercial purposes. Just that chatbot algorithms are kid of naive, and have been "fished" on several occasions.... The usage of LLM is too obvious, and way cheaper than hired personnel, so it's like "prism". They don't want us to talk about it because it's been going on for so long...