Problem in sharing image on share button of linkedin

I am using

<meta property="og:image" content=""/> 

for sharing image data on linkedin. It is working fine for facebook. I am able to get image while sharing on facebook, but when i am sharing on linkedin image is not there.

Also I am trying same for twitter using

 <meta name="twitter:image" content=""/>. 

here also I am not getting image after sharing.

Can anyone suggent possible reason for this and its solution.