Do Facebook's webcrawling bots (for example facebookexternalhit/*) respect the Crawl-delay: directive in robots.txt files?

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Don't dupe questions across sites. You got your answer over there, by the way. (See Jeff's bio.) – Su' Oct 19 '11 at 5:00
Boo... thanks @Su' - now how do I withdraw my bounty??? – Mike Hudson Oct 19 '11 at 6:59
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