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Think about it this way. If your work only allowed you to use a tablet to do your work, how productive would you be?

I'm pretty sure every business prefers a 'narrow view' of what productivity means. The article is in relation to productivity.

"Productive" is used in its more literal definition here: producing, m/aking, creating. It doesn't have to be shakespeare or picasso to still be a creative work.

You are allowed to find a device useful (i.e. gain value out of it) without being productive on it. That is why e-Readers sell a lot - they are useful. We're arguing about productive use cases here and that in my mind does not include commenting on facebook walls. If that is a narrow viewpoint then that's fine with me.