As others have mentioned, clicking through to their profile and using any contact details they've left is the best bet for this. If there's no information ther

As others have mentioned, clicking through to their profile and using any contact details they've left is the best bet for this. If there's no information there, they probably don't want to be contacted. But if you're someone who does want to be contacted, there are tools you can use to make sure you don't miss anything here: * HN Alerts will send you an email whenever someone replies to one of your comments: http://www.hnreplies.com http://www.hnreplies.com * HN Watcher, monitors HN posts for keywords, or you can follow certain users & have their comments & submissions emailed to you: http://hnwatcher.com/ http://hnwatcher.com/ I don't want yet another inbox I have to check (ie HN private messages!), but listing contact details in my profile & having alerts sent to my email has been really useful to me.