In the past, when I used the Facebook "share" button on my WP.com posts, the image in my post (I only use 1 at a time) would then appear as the thumbnail for my corresponding Facebook update. Now, as of a week or so ago, this doesn't happen anymore, and, I can't choose a thumbnail, either. (A "choose a thumbnail" option appears, but is grayed out - I can't click on it. Also, clicking on the arrows in that area no longer allows me to find the image from the WP post).
Any help would be appreciated!
The blog I need help with is transforminghealthcare.wordpress.com.