<meta charset="utf-8"/>
<meta name="title" content="my blog post">
<meta name="description" content="hello ">
<meta name="keywords" content="hello, hello, hello">
<meta name="robots" content="index, follow">
<meta name="language" content="English">
<meta name="author" content="Mohamed Meftah ">
Facebook og:title The title, name or headline
Twitter twitter:title A brief but comprehensive title of max. 70 characters
Facebook og:description A short description of min. 2 max. 4 sentences
Twitter twitter:description A brief description of the tweet max. 200 characters. Do not re-use the title as the description
Facebook og:image The URL of the image, at least 600x315 pixels, preferable 1200x630 pixels
Twitter twitter:image Add a unique not a generic image representing the content at least 280x150 pixels
Facebook og:url The canonical URL for your page without session variables, user id parameters or counters
Twitter twitter:card summery_large_image
<meta name="copyright" content="Copyright owner" />
<meta name="author" content="Author name" />
<meta name="twitter:card" content="summary" />
<meta name="twitter:site" content="@flickr" />
<meta name="twitter:title" content="Small Island Developing States Photo Submission" />
<meta name="twitter:description" content="View the album on Flickr." />
<meta name="twitter:image" content="<https://farm6.staticflickr.com/5510/14338202952_93595258ff_z.jpg>" />
https://developer.twitter.com/en/docs/twitter-for-websites/cards/overview/markup
<meta property="og:type" content="article" />
<meta property="og:title" content="Exploring Kyoto's Sagano Bamboo Forest - CNN.com" />
<meta property="og:description" content="A constant inclusion on lists of "forests to see before you die," here's how to see the real thing." />
<meta property="og:url" content="<http://www.cnn.com/2014/08/11/travel/sagano-bamboo-forest/>" />
<meta property="og:site_name" content="CNN.com" />
<meta property="article:published_time" content="2014-08-12T00:01:56+00:00" />
<meta property="article:author" content="CNN Karla Cripps" />
<title>Maximum length 60-70 characters</title>
<meta name="description" content="Page description. No longer than 155 characters." />
<!-- Twitter Card data -->
<meta name="twitter:card" value="summary">
<!-- Open Graph data -->
<meta property="og:title" content="Title Here" />
<meta property="og:type" content="article" />
<meta property="og:url" content="<http://www.example.com/>" />
<meta property="og:image" content="<http://example.com/image.jpg>" />
<meta property="og:description" content="Description Here" />
<!-- Place this data between the <head> tags of your website -->
<title>Page Title. Maximum length 60-70 characters</title>
<meta name="description" content="Page description. No longer than 155 characters." />
<!-- Schema.org markup for Google+ -->
<meta itemprop="name" content="The Name or Title Here">
<meta itemprop="description" content="This is the page description">
<meta itemprop="image" content="<http://www.example.com/image.jpg>">
<!-- Twitter Card data -->
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:site" content="@publisher_handle">
<meta name="twitter:title" content="Page Title">
<meta name="twitter:description" content="Page description less than 200 characters">
<meta name="twitter:creator" content="@author_handle">
<!-- Twitter summary card with large image must be at least 280x150px -->
<meta name="twitter:image:src" content="<http://www.example.com/image.jpg>">
<!-- Open Graph data -->
<meta property="og:title" content="Title Here" />
<meta property="og:type" content="article" />
<meta property="og:url" content="<http://www.example.com/>" />
<meta property="og:image" content="<http://example.com/image.jpg>" />
<meta property="og:description" content="Description Here" />
<meta property="og:site_name" content="Site Name, i.e. Moz" />
<meta property="article:published_time" content="2013-09-17T05:59:00+01:00" />
<meta property="article:modified_time" content="2013-09-16T19:08:47+01:00" />
<meta property="article:section" content="Article Section" />
<meta property="article:tag" content="Article Tag" />
<meta property="fb:admins" content="Facebook numberic ID" />