I was able to post a post on facebook with and without the hotlink protection code and with and without facebook.com being whitelisted, but out of 10 test posts, image retrieval worked 8 out of 10 times and failed 2 times. A logical explanation for something like that would be that the image retrieval script has a timeout / time limitation. Example: the image retrieval script tries for 3 seconds to get an image file. If it cannot get that image file in 3 seconds it does not try again.
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