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I guess, you got more answers by asking again this question using your name:
FB takes the first photo it finds as the photo for the post (you can sometimes change that). I notice when I copy and paste my AR blog to my personal site I get blank photos too. I have to change the domain in the URL. For some reason the URL changes to my website instead of AR. Maybe the same is happening to you.
Now you got it
What the answers!
a common problem, FB is fickle in this regard, just keep posting the url directly into the status box and eventually it will show up correctly.
Stuff happens. So do repeat questions.
I can't help with this one as I don't put my AR blogs on FB. Looks like maybe Ryan Huggins - Thousand Oaks, CA has helped.