We want to create a workflow that triggers when a user posts a comment on Facebook or Instagram. The idea is to evaluate the comments using ChatGPT to determine whether they are positive or negative. However, I can't find an option to use the comment as a variable anywhere. The user's last message appears to refer to a Messenger message. Is there an option to use comments in the same way? For example, as part of a ChatGPT prompt, similar to how messages are used?

So the effect is supposed to be that if the comment is positive, I send message no. 1 and if negative, message no. 2. etc.

There is no problem with using this logic in messages. Since you can use the last message as a variable in the chatgpt prompt.