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I don't think they're allowed to discuss if they work for Apple on Apple fan sites, etc... well that's what I heard. Not that Apple could find them out.
 
^^ Yupp. AFAIK, they have to sign a NDA so that they can't discuss things about the workplace on sites like these.
 
I know I've seen a few people posting around here that used to work in the Apple stores, but I don't think people in other positions can say much even if they aren't with Apple any more.
 
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