Chuck: I uninstalled your plugin because I wanted to try a few more things. Right now, using a new shortlink (that was one of the suggestions,) FB will pull images from my post, but NOT the first image in the post (which at this point is also all-new.)
I did check the debugger, and it's not making any sense! While it does give me some warnings, it initially showed as the og:image the very image that it's refusing to pull. When I went back to the debugger later, it now shows another image is the og:image.
Also, as the og:description it's showing the meta description I specified, which it refuses to recognize if you try to post the link on Facebook.
The warnings I'm getting say that the og url, title, description and image should be "explicitly provided." Since I always enter the full URL for my images, and I put the meta description and custom title tag in the correct area provided by WordPress/Thesis, I'm not sure how I can be more explicit.
I want to make sure I have this right: Using the debugger will clear the FB cache? If that's true, I'm thinking I should reinstall your plugin, specify my important image as the official "post image," run the debugger AGAIN, and see what happens.