So you want to add Facebook meta tags to your site? This won't take much time.
The Open Graph protocol enables any web page to become a rich object in a social graph.
ogp.me
Add the following meta tags to your site
<meta property="og:title" content="Facebook meta tags" />
<meta property="og:description" content="How to add Facebook meta tags" />
<meta property="og:image" content="http://timpietrusky.com/thumbnail.jpg" />
<meta property="og:url" content="http://timpietrusky.com/facebook-meta-tags" />
og:title
The title of your site.
og:descriptionA one to two sentence description of your site.
og:imageAn image URL which should represent your site. The image must be at least 200px in both dimensions and .jpg
og:urlURL of your site that will be used as its permanent ID in the graph.
To validate your meta tags, you can use Facebook Object Debugger developers.facebook.com/tools/debug
Just drop the link to your site and the Facebook Object Debugger will do the rest.