I can bet you are thinking know that I have to download facebook like thumbnail plugin, but the problem is that I already have it.
I am creating this blog: http://techgeek.lt/
If you press "like" in a post correct thumbnail will show up in the facebook account, but if you press on the sidebar "like" button, on facebook account appears one of the users gravatar :).. I really do not know how to fix it. Maybe, any help?