Facebook share not showing thumbnail image

Hi all,
I am having a problem with facebook share button as it is not showing the thumbnail image in the share. I looked around for the possible solution elsewhere and found that one has to apply properties to some “open-graph” meta tags.

When I applied “og” property with a direct link to the image, I have seen that facebook share was showing the thumbnail of the linked image. But, it was showing the same thumbnail image in all of my blog posts. I guess this is because I linked the meta properties of “og” to the single image!.

My blog is a dynamic one, means with each blog post, the title, description and images will change. So I cannot link single image to the “og” meta tag properties.

So, how can I resolve this problem. Is there any way to link “dynamic images” just like dymanic titles…..
Help me… this is very frustrating!