Unmaintained Facebook OpenGraph Image from [img] or [attach] tags 1.3

I've taken over the resource from Julian.


Small change in this update which I wanted for my own site (www.landcruiserclub.net) - if you embed a youtube video then this will extract the default creen grab for the video and use that as the og:image url


I have a few other bits I will add to it in the coming weeks. If you have any ideas then throw them this way and I'll try get them in.


As always, comments and suggestions welcome.

New features:

• A permission check is made to decide if we should use images within the [attach ] tag. If the current user doesn't have permission to see attachments, the [attach ] tag is skipped.
• The metatag has been moved to the top