Facebook open graphic tag

<meta expr:content='data:blog.pageName' property='og:title'/>    
<meta expr:content='data:blog.title' property='og:site_name'/>     
<meta expr:content='data:blog.canonicalUrl' property='og:url'/>     
<b:if cond='data:blog.metaDescription'>     
	 <meta expr:content='data:blog.metaDescription' property='og:description'/>     
</b:if>     
<b:if cond='data:blog.pageType == &quot;item&quot;'>     
	 <meta content='article' property='og:type'/>     
	 <b:if cond='data:blog.postImageThumbnailUrl'>     
		 <meta expr:content='data:blog.postImageThumbnailUrl' property='og:image'/>     
	 </b:if>     
<b:else/>     
	 <meta content='blog' property='og:type'/>     
	 <meta content='*http://4.bp.blogspot.com/-qmTMlpKuSyo/Ul-qoeMgTLI/AAAAAAAAEIE/3Np3myyuRhg/s1600/1376444_257519191063553_1283162022_n.jpg*' property='og:image'/>     
</b:if>


But it shows my image only a small size 72x72 . and i want to ask all of you how to get better size . 

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