Puzzled by a locative feature in this new app: http://www.theverge.com/2012/7/18/3165184/twist-ios-location-sharing-app-released
I installed it today and on first launch before I gave it any information about myself it took a (correct) guess at my home address. How in the world was it able to determine this? It correctly guessed my colleague's address as well. As I understand it, iOS no longer keeps a running history of the device location on disk (http://www.akuaku.org/2011/04/iphone-4-spidey-bug.html). And in any case it seems unlikely to be using simply lat/long history as it guessed my colleagues apartment number correctly. I did have my address in my record in the Contact app, but as far as I know there is no way to know which record in the Contacts database is the device owners. And the guessed address was different textually from the Contacts address. I did give the location API permission to run on launch, and after a delete-reinstall-launch without that location permission it wouldn't go into the mode where my address was revealed, so the location services could be required (but not necessarily of course). I'm not aware of any iOS location service that explicitly (or could cleverly) returns home address though. It seems like a nice hack and I'd love to use it in my own app. Anyone have any ideas? -- Dav Yaginuma http://AkuAku.org/
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