Notify me or bookmark some new discussions based on their tags when you are offline, automatically?!

We're founding a forum using vanilla. One of my colleagues asked me how to follow tags? That is how we automatically know the questions with a particular tag? For example, auto bookmark or better a notification we get on a new question tagged with "NewYork"! It means I want to follow all questions tagged with (i.e) Newyork.
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Comments
you could modify
http://vanillaforums.org/addon/shwaipbot-plugin
I may not provide the completed solution you might desire, but I do try to provide honest suggestions to help you solve your issue.