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Apple iOS 6 Maps is one of the most controversial new features. I have found it to work fairly well for me and I enjoy the new 3D Flyover functionality not seen to this level of detail in Google Maps. The turn-by-turn is handy, when correct, and it beats having to pay for a dedicated offline GPS navigation solution.
I used Siri primarily for creating reminders, but am already finding this iOS 6 version more useful as I create reminders and calendar appointments, check on my sports scores, create notes, and more.
Facebook integration: Similar to how iOS 5 added Twitter share integration, iOS 6 adds Facebook integration so you can share to your social network.