Copied from http://code.lancepollard.com/complete-list-of-html-meta-tags/
<meta charset='UTF-8'>
<meta name='keywords' content='your, tags'>
<meta name='description' content='150 words'>
<meta name='subject' content='your website's subject'>
<meta name='copyright' content='company name'>
<meta name='language' content='ES'>
<meta name='robots' content='index,follow'>
<meta name='revised' content='Sunday, July 18th, 2010, 5:15 pm'>
<meta name='abstract' content=''>
<meta name='topic' content=''>
<meta name='summary' content=''>
<meta name='Classification' content='Business'>
<meta name='author' content='name, [email protected]'>
<meta name='designer' content=''>
<meta name='reply-to' content='[email protected]'>
<meta name='owner' content=''>
<meta name='url' content='http://www.websiteaddrress.com'>
<meta name='identifier-URL' content='http://www.websiteaddress.com'>
<meta name='directory' content='submission'>
<meta name='pagename' content='jQuery Tools, Tutorials and Resources - O'Reilly Media'>
<meta name='category' content=''>
<meta name='coverage' content='Worldwide'>
<meta name='distribution' content='Global'>
<meta name='rating' content='General'>
<meta name='revisit-after' content='7 days'>
<meta name='subtitle' content='This is my subtitle'>
<meta name='target' content='all'>
<meta name='HandheldFriendly' content='True'>
<meta name='MobileOptimized' content='320'>
<meta name='date' content='Sep. 27, 2010'>
<meta name='search_date' content='2010-09-27'>
<meta name='DC.title' content='Unstoppable Robot Ninja'>
<meta name='ResourceLoaderDynamicStyles' content=''>
<meta name='medium' content='blog'>
<meta name='syndication-source' content='https://mashable.com/2008/12/24/free-brand-monitoring-tools/'>
<meta name='original-source' content='https://mashable.com/2008/12/24/free-brand-monitoring-tools/'>
<meta name='verify-v1' content='dV1r/ZJJdDEI++fKJ6iDEl6o+TMNtSu0kv18ONeqM0I='>
<meta name='y_key' content='1e39c508e0d87750'>
<meta name='pageKey' content='guest-home'>
<meta itemprop='name' content='jQTouch'>
<meta http-equiv='Expires' content='0'>
<meta http-equiv='Pragma' content='no-cache'>
<meta http-equiv='Cache-Control' content='no-cache'>
<meta http-equiv='imagetoolbar' content='no'>
<meta http-equiv='x-dns-prefetch-control' content='off'><meta name='og:title' content='The Rock'>
<meta name='og:type' content='movie'>
<meta name='og:url' content='http://www.imdb.com/title/tt0117500/'>
<meta name='og:image' content='http://ia.media-imdb.com/rock.jpg'>
<meta name='og:site_name' content='IMDb'>
<meta name='og:description' content='A group of U.S. Marines, under command of...'>
<meta name='fb:page_id' content='43929265776'>
<meta name='application-name' content='foursquare'>
<meta name='og:email' content='[email protected]'>
<meta name='og:phone_number' content='650-123-4567'>
<meta name='og:fax_number' content='+1-415-123-4567'>
<meta name='og:latitude' content='37.416343'>
<meta name='og:longitude' content='-122.153013'>
<meta name='og:street-address' content='1601 S California Ave'>
<meta name='og:locality' content='Palo Alto'>
<meta name='og:region' content='CA'>
<meta name='og:postal-code' content='94304'>
<meta name='og:country-name' content='USA'>
<meta property='fb:admins' content='987654321'>
<meta property='og:type' content='game.achievement'>
<meta property='og:points' content='POINTS_FOR_ACHIEVEMENT'>
<meta property='og:video' content='http://example.com/awesome.swf'>
<meta property='og:video:height' content='640'>
<meta property='og:video:width' content='385'>
<meta property='og:video:type' content='application/x-shockwave-flash'>
<meta property='og:video' content='http://example.com/html5.mp4'>
<meta property='og:video:type' content='video/mp4'>
<meta property='og:video' content='http://example.com/fallback.vid'>
<meta property='og:video:type' content='text/html'>
<meta property='og:audio' content='http://example.com/amazing.mp3'>
<meta property='og:audio:title' content='Amazing Song'>
<meta property='og:audio:artist' content='Amazing Band'>
<meta property='og:audio:album' content='Amazing Album'>
<meta property='og:audio:type' content='application/mp3'>Use custom meta tags to store data that you need in Javascript, instead of hard-coding that data into your Javascript. I store my Google Analytics code in meta tags. Here's some examples:
<meta name='google-analytics' content='1-AHFKALJ'>
<meta name='disqus' content='abcdefg'>
<meta name='uservoice' content='asdfasdf'>
<meta name='mixpanel' content='asdfasdf'><meta name='microid' content='mailto+http:sha1:e6058ed7fca4a1921cq91d7f1f3b8736cd3cc1g7'>
<meta name='readability-verification' content='E7aEHvVQpWc8VHDqKvaB2Z58hek2EAv2HuLuegv7'>
<meta name='google-site-verification' content='4SMIedO1X4IkYrYuhEC2VuovdQM36Xxb0btUjElqQyg'>
<meta name='ICBM' content='40.746990, -73.980537'>
<meta name='generator' content='WordPress 3.3.1'>
<meta name='norton-safeweb-site-verification' content='tz8iotmk-pkhui406y41y5bfmfxdwmaa4a-yc0hm6r0fga7s6j0j27qmgqkmc7oovihzghbzhbdjk-uiyrz438nxsjdbj3fggwgl8oq2nf4ko8gi7j4z7t78kegbidl4'><meta name="apple-mobile-web-app-title" content="My App"> <!-- New in iOS6 -->
<meta name='apple-mobile-web-app-capable' content='yes'>
<meta name='apple-touch-fullscreen' content='yes'>
<meta name='apple-mobile-web-app-status-bar-style' content='black'>
<meta name='format-detection' content='telephone=no'>
<meta name='viewport' content='width=device-width; content='width = 320; initial-scale=1.0; maximum-scale=1.0; user-scalable=yes; target-densitydpi=160dpi'>
<link href='/apple-touch-icon.png' rel='apple-touch-icon' type='image/png'>
<link href='touch-icon-ipad.png' rel='apple-touch-icon' sizes='72x72'>
<link href='touch-icon-iphone4.png' rel='apple-touch-icon' sizes='114x114'>
<link href='/startup.png' rel='apple-touch-startup-image'>
<link href='http://github.com/images/touch-icon-iphone4.png' sizes='114x114' rel='apple-touch-icon-precomposed'>
<link href='http://github.com/images/touch-icon-ipad.png' sizes='72x72' rel='apple-touch-icon-precomposed'>
<link href='http://github.com/images/apple-touch-icon-57x57.png' sizes='57x57' rel='apple-touch-icon-precomposed'><meta http-equiv='Page-Enter' content='RevealTrans(Duration=2.0,Transition=2)'>
<meta http-equiv='Page-Exit' content='RevealTrans(Duration=3.0,Transition=12)'>
<meta name='mssmarttagspreventparsing' content='true'>
<meta content="IE=edge,chrome=1" http-equiv="X-UA-Compatible"/>
<meta name='msapplication-starturl' content='http://blog.reybango.com/about/'>
<meta name='msapplication-window' content='width=800;height=600'>
<meta name='msapplication-navbutton-color' content='red'>
<meta name='application-name' content='Rey Bango Front-end Developer'>
<meta name='msapplication-tooltip' content='Launch Rey Bango's Blog'>
<meta name='msapplication-task' content='name=About;action-uri=/about/;icon-uri=/images/about.ico'>
<meta name='msapplication-task' content='name=The Big List;action-uri=/the-big-list-of-javascript-css-and-html-development-tools-libraries-projects-and-books/;icon-uri=/images/list_links.ico'>
<meta name='msapplication-task' content='name=jQuery Posts;action-uri=/category/jquery/;icon-uri=/images/jquery.ico'>
<meta name='msapplication-task' content='name=Start Developing;action-uri=/category/javascript/;icon-uri=/images/script.ico'>
<meta name='msvalidate.01' content='6E3AD52DC176461A3C81DD6E98003BC9'>
<meta http-equiv='cleartype' content='on'><meta name="news_keywords" content="World Cup, Brazil 2014, Spain vs Netherlands, soccer, football"><meta name='tweetmeme-title' content='Retweet Button Explained'><meta name='blogcatalog'><meta name='csrf-param' content='authenticity_token'>
<meta name='csrf-token' content='/bZVwvomkAnwAI1Qd37lFeewvpOIiackk9121fFwWwc='><link rel='alternate' type='application/rss+xml' title='RSS' href='http://feeds.feedburner.com/martini'>
<link rel='alternate' type='application/atom+xml' title='Atom 0.3' href='https://example.com/feed.atom'>
<link rel='shortcut icon' type='image/ico' href='/favicon.ico'>
<link rel='fluid-icon' type='image/png' href='/fluid-icon.png'>
<link rel='me' type='text/html' href='http://google.com/profiles/thenextweb'>
<link rel='shortlink' href='http://blog.unto.net/?p=353'>
<link rel='archives' title='May 2003' href='http://blog.unto.net/2003/05/'>
<link rel='index' title='DeWitt Clinton' href='http://blog.unto.net/'>
<link rel='start' title='Pattern Recognition 1' href='http://blog.unto.net/photos/pattern_recognition_1_about/'>
<link rel='bookmark'title='Styleguide' href='http://paulrobertlloyd.com/about/styleguide/'>
<link rel='search' href='/search.xml' type='application/opensearchdescription+xml' title='Viatropos'>
<link rel='self' type='application/atom+xml' href='http://www.syfyportal.com/atomFeed.php?page=3'>
<link rel='first' href='http://www.syfyportal.com/atomFeed.php'>
<link rel='next' href='http://www.syfyportal.com/atomFeed.php?page=4'>
<link rel='previous' href='http://www.syfyportal.com/atomFeed.php?page=2'>
<link rel='last' href='http://www.syfyportal.com/atomFeed.php?page=147'>
<link rel='canonical' href='http://smallbiztrends.com/2010/06/9-things-to-do-before-entering-social-media.html'>
<link rel='EditURI' type='application/rsd+xml' title='RSD' href='http://smallbiztrends.com/xmlrpc.php?rsd'>
<link rel='pingback' href='http://smallbiztrends.com/xmlrpc.php'>
<link rel='stylesheet' media='only screen and (max-device-width: 480px)' href='http://wordpress.org/style/iphone.css' type='text/css'>
<link rel='wlwmanifest' href='http://www.example.com/wp-includes/wlwmanifest.xml' type='application/wlwmanifest+xml'>## Other Resources
- [HTML5 Boilerplate explanations and suggestions of header tags](http://html5boilerplate.com/docs/head-Tips/)
- [Dublic Core Meta Tags](http://www.seoconsultants.com/meta-tags/dublin/)
- [Apple Meta Tags](http://developer.apple.com/safari/library/documentation/appleapplications/reference/safarihtmlref/articles/metatags.html)
- [OpenGraph Meta Tags](http://opengraphprotocol.org/)
- [Link Tag Meaning](http://intertwingly.net/wiki/pie/LinkTagMeaning)
- [Google Chrome HTML5 Tags](http://www.html5rocks.com/)
Basic HTML meta tags, like title, description, and viewport, help RailsCarma optimize its website for SEO, improve accessibility, and ensure mobile responsiveness.