Already Instagram is one of the most popular photo apps in iTunes.

Instagram则是iTunes上最流行的照片应用之一。

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Mobile Social photo apps: The end of 2010 witnessed a spate of mobile photo apps including Instagram, PicPlz and Path.

移动社交照片应用：2010年底出现了一批移动照片应用，包括Instagram、PicPlz和Path。

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It's one of the most widely used free photo editing apps in the world.

它是世界上使用最广泛的免费图片编辑应用程序之一。

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The market for photo apps is crowded, with services from Instagram to Google to Facebook.

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There are many other photo apps such as Instagram that have large growth numbers.

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The built-in "Gallery" app will show picture previews, but other photo apps won't.

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