I'm trying to get my website show thumbnail while sharing on Facebook or Twitter but I get nothing.

I added these meta tags:

HTML Code:
<meta property="og:title" content="www.yupshare.com" />
<meta property="og:type" content="article" />
<meta property="og:url" content="http://www.yupshare.com" />
<meta property="og:image" content="http://www.yupshare.com/thumbnail.jpg" />
<meta property="og:site_name" content="yupshare"/>
<meta property="og:description" content="Yupshare.com is an amazing way to share what you love easily and freely" />

<meta property="twitter:card" value="summary" />
<meta property="twitter:site" value="@yupshare" />
<meta property="twitter:creator" value="@yupshare" />
<meta property="twitter:url" value="http://www.yupshare.com" />
<meta property="twitter:title" value="www.yupshare.com" />
<meta property="twitter:image" value="http://www.yupshare.com/thumbnail.jpg" />
<meta property="twitter:image:width" value="180" />
<meta property="twitter:image:height" value="180" />
Can anyone tell me what's wrong? my website is http://www.yupshare.com

Thanks