This is under CS graduate majors in my host university, so I would want to confirm first here.
Please up vote if yes and down vote if no (where yes or no are related to belong or not belong).
Or please drop an answer if it is more suitable.
I don't see a problem with HCI questions in this forum. The more, the merrier.
Our CS faculty even offers a bachelor course on HCI, so I'd say its definitively on-topic here.
Do watch out for questions that are not good subjective questions, are not vague, overly broad or otherwise unanswerable. These are the usual criteria for every question here (not just HCI questions), but in the case of HCI I think you have to be even more careful.