Commonly Used MODX Head Tags for use in my Public Snapshots

Commonly Used MODX Head Tags

<title>[[*pagetitle]]</title>
<title>[[*longtitle:default=`[[*pagetitle]]`]]</title>
<meta name="description" content="[[*description]]">
<meta name="keywords" content="[[*keywords]]">

<meta itemprop="url" content="[[~[[*id? &scheme=`full`]]]]">
<meta itemprop="name headline" content="[[*pagetitle]]">
<meta itemprop="description" content="[[*description]]">
<meta itemprop="image" content="">
<!-- Twitter -->
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:title" content="[[*pagetitle]]">
<meta name="twitter:description" content="[[*description]]">
<meta name="twitter:image:src" content="">                  
<!-- Facebook -->
<meta property="og:type"                 content="website"> 
<meta property="og:site_name"            content="[[++site_name]]">
<meta property="og:url"                  content="[[~[[*id? &scheme=`full`]]]]"> 
<meta property="og:image"                content="">
<meta property="og:title"                content="[[*pagetitle]]">
<meta property="og:description"          content="[[*description]]">
<meta property="fb:app_id"               content="">