Recently, Facebook has changed the format of some shared posts. Specifically posts to share links. By testing I found that the difference was to define the post how to 'article'. The links defined how to 'articles' published with the big picture, however if you do not specify that it is a 'article' leaves a small image with the description on the right.
http://www.subirimagenes.net/i/131108113602877288.jpg [Example of old posts with a small picture]
http://www.subirimagenes.net/i/131108113602194357.jpg [Example of new posts with a big picture]
Using meta tags og: type I can say that it is a 'article' and when it is published large image is displayed.
What I want is to do the same with a share button using the php SDK. I do not know how to indicate that it is a 'article' and get to show me the big picture.
Thanks in advance.