What Makes a Reader Comment

So I write a lot or try to and I just became recently kind of curious as to what would make you comment on a story or what you think makes people comment on stories?

I find I try to comment throughout a story I'm reading; especially if it is one I'm particularly invested in-at the moment that is only one fanfic so whenever the writer updates I make sure to comment but for now that is about all I manage to do.

What about you?

Edit: Just wanted to clarify that this is just a question and not me trying to be rude or disrespectful

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