iphone - Geolocation based push notification -

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i'd like to push an alert to my iphone users that are within a geographic range. i can get their location when my app is "alive," but not otherwise. would a good approach be: send the localized alert based on users that appeared "in-range" in the last hour? otherwise, i'm not sure how to only alert relevant users. is there a smarter approach?

the lack of background processing hurts applications this. think solution best approach, given rather severe limitation. however, should offer ability tone down, start annoying.


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