Social pulls "wrong" graphic

When there is a blog post with no image associated, as either an embedded image or as a featured image, the Social plugin still posts a photo with the link to Facebook. Too often this image is from the/a previous post, and doesn’t go with the post at all. Social should use NO IMAGE if there is no image associated with the blog post.

http://ww.wp.xz.cn/extend/plugins/social/