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Loopt, a location-aware mobile application and social network, just announced that it will become the first third-party iPhone app that will be able to offer an always-on location service on the iPhone. From what we have seen, AT&T officially sanctioned this feature, which Loopt already offers on other platforms. Normally, apps can't run in the background on the iPhone. This is clearly a severe limitation for a lot of developers, and few developers have the clout to get around this limitation the way Loopt apparently did (Loopt demoed its app at WWDC last year).