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Neither. Path or something similar on the mobile will quietly take over because the distance between the camera and the upload button will be smaller, and tablets, and more importantly, 5" to 7" phablets, will become the ubiquitous perfect middle ground between telephony and browser and video game console.

FB will be forced to provide a comprehensive export feature by law, which will make the jump easier.

FB knows this.

This is, of course, a personal, subjective viewpoint / projection of the path of least resistance ahead.