Facebook Google Twitter social media tags for social sharing

<!-- for Google -->
<meta name="description" content="" />
<meta name="keywords" content="" />
<meta name="author" content="" />
<meta name="copyright" content="" />
<meta name="application-name" content="" />

<!-- for Facebook --> 
<meta property="og:title" content="" />
<meta property="og:type" content="article" />
<meta property="og:image" content="" />
<meta property="og:url" content="" />
<meta property="og:description" content="" />

 debug url : http://developers.facebook.com/tools/debug

 <!-- for Twitter -->

<meta name="twitter:card" content="summary" />
<meta name="twitter:title" content="" />
<meta name="twitter:description" content="" />
<meta name="twitter:image" content="" />

more : http://stackoverflow.com/questions/11616697/how-to-use-og-meta-tag-for-facebook-share