We have a few blog owners, reporting problems with sharing their blogs to FaceBook. When I share my blog on FaceBook, the photo from the blog doesn't appear. Some blurry pencil appears instead. What the blog owner is seeing, is the effect of the FaceBook Share wizard, grabbing an unwanted photo, from the page being shared. You have 2 choices, if you want to share blog content to FaceBook - and have it all look attractive. Publish every post, containing a photo that FaceBook will want to use. Add FaceBook Open Graph code, to your blog.
What Blogger won't tell you