Just add it and get automatic comments from HN right in your blog/page. However I'm discontinuing it soon after HN asked me to do so, but it shouldn't be too difficult for anyone motivated to do their own.
IANAL. IMHO That is up to each individual's decision. I actually asked them and they said they really don't want other people to embed comments on their website. BUT a case could be made about fair use, embedabble content and the fact that there is no effective terms and conditions on HN, just a FAQ (so I think they don't have the exclusive copyright of the comments). Plus the whole YCombinator ethos of asking for forgiveness instead of permission.
So I am discontinuing it just because HN is awesome and they asked nicely. But other people might consider things differently.
And who am I to judge the morality of other people in different cultures? What is legal and moral in a country is totally dependent on the culture and many times it has little to do with legality.
Just add it and get automatic comments from HN right in your blog/page. However I'm discontinuing it soon after HN asked me to do so, but it shouldn't be too difficult for anyone motivated to do their own.