Facebook isn't scanning your page. If you scroll to the bottom of the debugger view, you'll see the "See exactly what our scraper sees for your URL" link, which is completely blank when clicked on.
That means one of the following is happening on your site:
1) There's a firewall or other security restriction that's preventing Facebook from scanning your pages. They use their own browser User Agent string, and it may not be allowed from your configuration. I'd recommend going through your Apache access logs to see if you can find the request made when you run your page through the debugger and see if a 200 (status OK) response code is sent.
2) Your site, or more likely your IP address, is blocked by Facebook. The IP can be blocked if you're on a shared-hosting environment and one of the other sites that share your IP has been blacklisted. In this case, you need to either:
a) Contact your hosting provider and have them move your IP or contact Facebook to un-restrict your IP
b) Try to open a
Bug Report
with Facebook.
Hopefully you can solve the issue with #1 as that doesn't force you to wait for Facebook or your host to investigate the issue.
I hope that helps,
Alex
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