I don't know exactly what they do prompt wise, but i know they fine tuned the settings to be more, social.

Their API backend is "playground", lets you choose a model (GPT3 / ChatGPT is their top right now), but also lets you set the "temperature", "Frequency", and "presence" settings that can make it more attune to building stories and the like..

What i meant by manipulate the whole prompt is that you get 4096 Tokens to play with and when you ask ChatGPT to rewrite a paragraph, it feeds the prior conversation through with it... So it can get weird, in the playground you can strip your extra prompts from the scope and it has a much easier time remembering places and people..

One story i wrote even brought back 2 characters from a minor interaction chapters before..