Facebook image posting issue

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C#

Facebook-API

I tried to post images to my facebook page wall using my C# application. But it is showing only as small Thumbnail on left side. Like

http://i26.photobucket.com/albums/c140/musk868686/Image1_zps40578867.png


But what i need is full width display like

http://i26.photobucket.com/albums/c140/musk868686/Image2_zps62cd245d.png

I knows the Optimize your image sizes policies of Facebook. My image meets their 600 x 315 size. For your reference this is the link to that image

http://i26.photobucket.com/albums/c140/musk868686/fb_b1a46d17-fc5e-4174-9fd5-3a54a604cc55_zpsbfc75c7a.jpg

and this is the link i used to share the image.

Is there any work around to overcome this?