SimpleGeo And Urban Airship Partner Up For Location Notificationstechcrunch.com 9 pointsmtrichardson15 years ago1 commentSaveHideCopy link On HNComments−elbac15yXtify (http://xtify.com) has been doing this for quite sometime already.
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Xtify (http://xtify.com) has been doing this for quite sometime already.