It relates to the way you’re trying to incorporate this into your site. I think you’re doing it for Facebook? This would work if the content here didn’t contain all of the HTML tags, but the way it is being feed through as entire HTML document into a meta tag, the web browser doesn’t know how to handle it, and so it’s just spitting it all out.
Are you sure you’re not trying to output this content somewhere else? And not within a meta tag for Facebook?
Is this something you’re trying to do with this plugin? http://wordpress.org/support/plugin/add-link-to-facebook — I have no idea how that’s supposed to work, so you may want to post in their support forum for the plugin.