There are not even 10 billion humans on the planet earth, or other planets that we know of. But Apple has managed to sell 10 billion apps, nearly 7 billion in the past year through their App Store. Apple announced that they were giving away a $10,000 App Store gift card to the person that bought the 10 billionth download. Apple said the winner of the gift card was Gail Davis of Orpington, England.
Gail hung up on the initial attempt from Apple to notify her as the $10,000 winner, but responded to a second notification attempt much more receptively. Gail downloaded the 10 billionth app from Apple's App Store, Paper Glider to was the lucky app winner.
I would suspect that App Store downloads would top 20 billion before the end of 2011, especially if you include Mac App Store sales to the iOS App Store.
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