I've been Googling, and looking through these forums, and haven't had any luck with this. I'm hoping someone can help as facebook docs are no help whatsoever.
I have a wordpress blog set up with multiple users. Those users log in and enter their own blog posts into WordPress. I have one user who also has a Facebook account. When he links to any of his wordpress blog entries on his Facebook wall, another user's avatar displays next to that link.
How is facebook determining what WordPress avatar to display? Is there anything I can do in the wordpress post/page to "help" facebook grab the correct avatar? I know it isn't a Gravatar thing, because these users aren't set up with gravatars.
Any hints, clues, or information is greatly appreciated!