For example, to see all comments containing links to x.com:
https://news.ycombinator.com/from?site=x.com&kind=comment
Or all GitHub links:
https://news.ycombinator.com/from?site=github.com&kind=comment
Remarkably it matches subdomains too. Here’s all gists posted to HN:
https://news.ycombinator.com/from?site=gist.github.com&kind=comment
The submitted url shows all HN links posted to HN (i.e. comments containing news.ycombinator.com):
https://news.ycombinator.com/from?site=news.ycombinator.com&kind=comment
Note that this is distinct from showing comments with links to ycombinator.com, which doesn’t show links to HN:
https://news.ycombinator.com/from?site=ycombinator.com&kind=comment
I find this impressive, since it’s not merely matching text (otherwise site=ycombinator.com would also show HN links).
You can even set site=github.com/antirez to find comments with links to antirez’s repos:
https://news.ycombinator.com/from?site=github.com/antirez&kind=comment
site=x.com/paulg doesn’t work though, so apparently site=domain.com/path only works for certain domains.
I just discovered this, and embarrassingly emailed Dan asking whether kind=comment was broken since I didn’t understand what I was looking at. Was this announced somewhere and I missed it?