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I think the point is, if smartphone cameras eventually get to say 40MP then people will start uploading at that resolution even if there's absolutely no benefit from it. The image may then be scaled down to be shown on the page, but FB can keep the original.

it would be cool to make group pictures, though.

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Isn't one of Nokia/Microsoft's phones, currently on market, at 42 megapixels?

It is; and the PureView 808 (Symbian) has had that before. But even though the full-resolution shot is saved for post-processing you usually get a 5- or 8MP shot that's your actual final image.

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