First of all, I don't if this has been discussed previously or not. If it has been discussed please direct me to that thread.<p>I often lose track of a discussion I was interested in because I simply don't get notified about any new activity in that thread (replies to my comments, new comments on thread etc.). I feel like a notification system would be a major improvement to HN.
There are feeds and a lot of people who have built an api for HN maybe you could use one of these sources for the data and build your own concept ?<p>Please it is the weekend.
Because the system powering Hacker News is horrible legacy software with a horrible architecture language-wise. Unless they are mission critical - don't expect to see improvements, new features or major updates any time soon.