[Plugin: Sociable] How to get Facebook to show image icon

Sociable is working exactly as advertised and I’m very happy with it, but I have one question.

When I click on the Facebook icon to add my page, all that shows up is the blog title and text. No website icon or image of any kind. I see many times on pro sites that there is the ability to include somehow an icon or image to accompany the text and link. Does Sociable support this kind of thing, and if so, how do you implement it?

http://wordpress.org/extend/plugins/sociable/