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by mxab 2167 days ago
Couple of things:

* Crawl apartment listings and get notified a lot faster than the official notification channels take.

* Monitor the inventory/promotions of some vendors, e.g. for bikes, that are currently out of stock

* Get notified when there's an peak of interest in a specific topic on twitter. I use this to monitor my employer, my project, and any stocks I own.