> I'm sure if @Dang had spare time there would be a filter, during submission of a new link, to check whether the exact same link already exists. There is. Dup

> I'm sure if @Dang had spare time there would be a filter, during submission of a new link, to check whether the exact same link already exists. There is. Duplicate submissions get redirected to the existing thread. Sometimes it doesn't kick in, for reasons obscure.