Descrição para compartilhar o facebook

metatag_facebook.html

<meta property="og:title" content="Facebook Open Graph META Tags"/>
<meta property="og:image" content="http://davidwalsh.name/wp-content/themes/klass/img/facebooklogo.png"/>
<meta property="og:site_name" content="David Walsh Blog"/>
<meta property="og:description" content="Facebook's Open Graph protocol allows for web developers to turn their websites into Facebook "graph" objects, allowing a certain level of customization over how information is carried over from a non-Facebook website to Facebook when a page is 'recommended', 'liked', or just generally shared."/>