You can favourite comments on HN and the lists are public so you can browse others favourites. This is a little known feature but I like it. For an example here are my favourite comments:

https://news.ycombinator.com/favorites?id=weinzierl&comments...

I didn't put a lot of thought in it, I just favourite stuff I might want to reconsider later. One example I still like is:

>You can hide from your your boss, your wife, or even your mother, but you can’t hide from Facebook.

Browsing others pages can be quite insightful for what they find notable. Not everyone uses this feature, so not everyone has favourites and it takes a little digging to find good ones. For example here are Thomas Ptaceks:

https://news.ycombinator.com/favorites?id=tptacek&comments=t