AddThis

Adding multiple image tag for Pinterest

Hi Team,
We have implemented Addthis plugin in our website
http://uat.8rewardsroad.com.sg/club21global_revamp/index.php/styledossier/article/item/4fd016757b408/setting-up-spring2/sg/en

In which we are trying to pass the multiple images for Pinterest component.
as below
<meta property="og:image" content="image1"/>
<meta property="og:image" content="image2"/>
<meta property="og:image" content="image3"/>
<meta property="og:image" content="image4"/>

But the Pinterest component takes only image1 & image4 in the preview. we need to pass all the images to preview.

but it works well with http://pinterest.com/about/goodies/

what could be the issue? we missed out anything?
Kindly help us to solve this issue, we are stuck in last bit.

Thanks
Anand