CAT-SOOP should have an integrated forum / Piazza replacement. Jeremy Kaplan's QnA was very close to getting things right here. That would be a good place to start when revisiting this.
I think the big win we can get over an external system is context; questions can be associated with pages (or, maybe, with sections or paragraphs or questions) in a direct way, and user accounts don't have Piazza's level of indirection.
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