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> For instagram, a key micro problem was it took too long to upload photos from a phone. They solved it by pre-uploading it.

Say what‽ Does Instagram just upload everything? Or do they start uploading a picture as one is editing the comments and such?

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My understanding is once you have selected a photo, they upload it in the background while you're doing other things (like typing the caption). If you decide to cancel it, I believe (hope) they delete it from the server.

But it's the specific photo, not your whole album (that would be pointless ( and expensive) to do).

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