Thanks Alex,
Yes, this does explain it, but it doesnt seem to be working correctly. The og:image is defined (see screengrab):
and the link is correct for the thumb:
kisscam.com/images/photos/749/4/thumb_ba...ad4287bbcfcb337b.png
but i still get the small icon, whats funny is this icon is not on the page or even on the site, it is definitely being pulled from the Facebook App.
PS: I also have JomSocial set to automatically assign the first photo as a "Cover Photo", in the case above I changed it manually. The cover photo is fine, it would be nice of course to have the actual uploaded photo be the one the image that is posted...but for now, this works.