Are you sure that your server allows hotlinking of your images?
Yes, I'm pretty sure it does. I just added the code I showed on Joe's page and it seemed to work perfectly.
You're the first one to report this issue but the v. 1.3 of this plugin is quite new. I'll test if I can reproduce this issue at my website.
Unless people read the thread carefully at places it almost seemed like you didn't to thumbnails on purpose. At least that was my impression when I just skimmed the thread of course I found out differently when I went back over the thread. But I'm pretty bad at jumping to conclusions LOL!
I can also look at this as Joe may want to keep his plugin a meta description and a rel"canonical" plugin.
I don't remember does your plugin add the description to the Facebook posting? Joe's does add the description and it works with your code (if yours doesn't add the description)and with his routine it might be easier to add the thumbnail link meta data.
Whatever you guys decide is best is fine with me!!!!!
Keep all the meta stuff in one plugin or keep all the Facebook stuff in one plugin or whatever makes sense for you guys that are actually doing the work!
One additional thought to consider is having the "-" Album Name and the "-" at the end. To me it seems to be clutter and most people using Facebook don't really need to know the album name. If people do want the album it might make more sense if it was at the end in parentheses ie filename (Album).
Rushing out the door, hopefully this made sense, I check back and clear it up tomorrow if necessary.
Thanks for looking at this, I really appreciate the work you guys do!