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Do you mean just use the RSS feed for a tag as an alert? That is one solution.
Oh! I actually was unaware that Hubski already supported RSS. RSS is the perfect solution for that, and there's already tools you can use to get email from RSS. That having been said, I'd support having an email notification if you decide that it's not too much more added complexity, but I probably wouldn't use it (I use an RSS reader anyway).
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Yes, there might be better ways than an email as RSS almost creates that off-site option now. I kind of like the idea of being able to break your feed into tag-only, user-only, and domain-only content, as dashnhammit suggests.