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If the page is temporarily unavailable, I should try again and again and again to access it. But if the link has expired, I am wasting my time trying to access it again and again. And if I don't have permissions, how do I get it? There's no helpful tip given as to how to get permission to view the image.
Surely Facebook could tell me which of these is the true problem and suggest what I do next.
I would qualify this as a variation of GUI blooper #28.