If you TW in class, every student receives it and gets to potentially benefit from it, and you can provide it immediately before the potentially triggering content arrives, rather than providing a blanket warning that it will come up at some point that day. It makes more sense to provide a public TW for any trigger that might be relevant to other students who have decided to not come forward about having triggers (so, the really common ones — sexual assault, murder, gore, blood, etc, but also eating disorder related content like calories and weight talk and food). It might be more practical to use a private TW for very specific/rare triggers that you are unlikely to use once the student triggered by that content is no longer in your class. But generally I default to public.

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