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This marks the public release of one of the fastest growing social media apps ever. The main functions of the app were dedicated to phones, which makes its popularity surprising. The original app was iPhone only as well.
1 Millionth Instagram User
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This milestone is a very good reference to how quickly Instagram grew in popularity from its launch.
Instagram "iPhone app of the Year"
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Apple would feature Instagram as "App of the Year" in the App Store. This would result in an increase in downloads of the app and it becoming recognised by many more people.
