Facebook increased the maximum size of their photos on March 1st. (see Roadmap)
The API documentation for the Photo object still states that the images array contains the 4 different stored representations of the photo, but it actually returns 7 images now.
For the example image the following array is returned:
Spring social currently processes the images by array index. Since the change, images of a totally different size are returned for the existing getters on the Photo class.
A simple solution would be to make all image sizes available through the Photo class, so users can lookup the image they want by width/height.