Great idea, but as I suggested on your website, you should have a favicon. It's part of the identity of a website. If you don't have it, it feels like something is missing.
Overall good idea, but I'd say: obviously I wouldn't use this for my regular feeds, only for some specific ones for which I want live notifications. So maybe some basic filtering options would be good (by keyword, by author...).
(Or maybe it's implied people would use existing services for filtering?)
Oh, and having tried it a bit with a twitter search feed, maybe you could have some options for formatting too (with replacements like %t for title, %u for url etc.).
(But of course both these suggestions break the simplicity of it, which has its appeal.)
EDIT: also, I'd add the basic instructions (STOP, START etc.) at the bottom of the front page.
Very cool app.! I was going to build it myself but you beat me to it. Now, can someone build a feed for HN submission comments/comment replies? And why not a feed for StackExchange answers/comments ?
1) send STOP to the bot. More info here: http://www.rss.im/help
or send HELP to the bot
2) that's what verification code is for. chatbot won't send notifications or even feed's url and title until the account is verified
Good to see you build this app. I actually created a similar app some time back just to get notified on few feeds I am actively following. It is on appengine http://enginebolt.appspot.com/
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[ 3.3 ms ] story [ 43.1 ms ] thread(Or maybe it's implied people would use existing services for filtering?)
(But of course both these suggestions break the simplicity of it, which has its appeal.)
EDIT: also, I'd add the basic instructions (STOP, START etc.) at the bottom of the front page.
Those 2 questions can block some new user to try the service I think.