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I don't think posting PSDs is a dick move - they're just gussied-up screengrabs as far as I can see. Obviously you can't sell them or misattribute them, etc.

But you need to decide whether you're asking permission or getting offended. I don't think you can have it both ways.

edit: you do misattribute them (e.g. "Facebook Timeline UI by Luke Chesser" https://github.com/lukechesser/Popular-UIs/ )