[jeffhuys]

There was a website called (I believe) Arguman (way) in the past, that used this kind of thing. It allowed everyone to add arguments, rebuttals, such a thing, and up/downvote them. Last time I looked at it, it was down (still on wayback, but it was a webapp, so it never really loads anything).

Edit: it's... "up", but suddenly Turkish and broken: https://arguman.org

[nilsherzig]

https://kialo.com also works this way