I really don't know... I doubt Facebook has staff to answer these questions. Do you have any kind of custom htaccess file? I was hoping the link above would have reminded you about something you setup that may be interfering.
I can't really think of any reason Facebook's spider is getting a 301 redirect when regular users do not except for a custom setting in htaccess or the server.
You may see if your host has an answer but I doubt they will.
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