> But now I want to write an "HN Alerts" service that notifies you whenever someone writes a comment with a certain keyword.
You should absolutely do this.
You should absolutely do this.
[0] https://zapier.com/zapbook/webhook/rss/8249/hacker-news-ment...
It uses the awesome HNSearch API to poll for new mentions of phrases and triggers a Zap whenever it finds one. (I have it send me an SMS).
Here's a better, more direct Zap Template: http://zpr.io/gsjS
(I know how busy you are, so I'll always be brief.)