Social media friendly head tags

HTML: Head tags

<!-- Prefetching -->
<link rel="dns-prefetch" href="//fonts.googleapis.com">
<link rel="dns-prefetch" href="//ajax.googleapis.com">
<link rel="dns-prefetch" href="//googlecode.com">

<!-- Stylesheets -->
<link rel="stylesheet" href="http://site.com/style.css">

<!-- Meta -->
<title>Page title - Site name</title>
<meta charset="utf-8">
<meta name="description" content="Page description">
<meta name="author" content="Page author">
<link rel="canonical" href="http://site.com/canonical">
<link rel="shortcut icon" type="image/x-icon" href="http://site.com/favicon.ico">
<meta name="robots" content="index, follow">

<!-- Other languages -->
<link rel="alternate" type="text/html" href="http://site.com/canonical?lang=fr" hreflang="fr" lang="fr" title="Français">

<!-- OpenGraph -->
<meta property="og:title" content="Page title">
<meta property="og:site_name" content="Site name">
<meta property="og:description" content="Page description">
<meta property="og:image" content="http://site.com/logo.gif">
<meta property="og:type" content="website">
<meta property="og:url" content="http://site.com/canonical">
		
<!-- Twitter Card -->
<meta name="twitter:title" content="Page title">
<meta name="twitter:card" content="summary">
<meta name="twitter:site" content="@site">
<meta name="twitter:creator" content="@author">
<meta name="twitter:url" content="http://site.com/canonical">
<meta name="twitter:description" content="Page description">
<meta name="twitter:image" content="http://site.com/logo.gif">

<!-- Google Plus -->
<meta itemprop="name" content="Site name">
<meta itemprop="description" content="Page description">
<meta itemprop="image" content="http://site.com/logo.gif">
<link rel="publisher" href="https://plus.google.com/insert_author_id_here/">

<!-- Mobile -->
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<link rel="apple-touch-icon" href="http://site.com/touch.gif">
<link rel="apple-touch-icon-precomposed" href="http://site.com/touch-precomposed.gif">

<!-- RSS & Atom Feeds -->
<link rel="alternate" type="application/rss+xml" title="RSS" href="http://site.com/rss.xml">
<link rel="alternate" type="application/atom+xml" title="Atom" href="http://site.com/atom.xml">

<!-- Head Scripts -->
<script src="http://site.com/modernizr.js"></script>