I researched a lot but i did not find best solution for my problem.
When I share any link of my blog post on facebook then it shows very small display Picture.
But I want fully large picture when we share a link. Today i saw a facebook link with a very large size. So I came to know that its possible to have large size of image on sharing the link at facebook.
So please some one give me the best solution for this.
This is screenshot of the post shared on facebook with large preview: