I have that problem a lot in active discussions. I tend to comment in the good ones so I generally just look at the time of my last comment and skim the post ti

I have that problem a lot in active discussions. I tend to comment in the good ones so I generally just look at the time of my last comment and skim the post times to see which ones came since then. This sounds like a good opportunity for an HN browser extension or greasemonkey script.