facebook og:title hex entity

You must entity facebook og:title. I use smarty but escape modifier can't escape hex.

Please see this paragraph "Get Open Graph Tags" on below page. https://developers.facebook.com/docs/reference/plugins/like/

• Sample

<meta property="og:title" content="{$page_title|escape_hex_entity}" />
<meta property="og:type" content="article" />
<meta property="og:url" content="http://ja.wikipedia.org/wiki/%E5%90%BE%E8%BC%A9%E3%81%AF%E7%8C%AB%E3%81%A7%E3%81%82%E3%82%8B" />
<meta property="og:image" content="" />
<meta property="og:site_name" content="吾輩は猫である - Wikipedia" />