(Apologies if this has already been requested, it’s a tricky one to search for.)
Slack has an awesome feature where you can set highlight words which trigger a notification. I think that would be incredibly useful.
Would it be tricky to impliment?
I believe you have all the hooks available to do that in a plugin. Listen for post_created and post_updated and generate notifications whenever the raw contains one of the highlighted words.
The hardest part will probably be the UI 
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Another form of this is the “saved search” where a search is performed every (x) days or hours, and any new matches for the search are sent via email.
You can see this on eBay and the like.
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Yes, I believe @pfaffman was asking about this recently as well.
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