本文介绍了Open Graph (OG) 协议的基本概念及应用方法，OG协议允许网页成为社交图谱中的富媒体对象，有助于内容在社交网络上的有效传播。
代码：
<meta property="og:title" content="Pack is for people who love their dogs." />
<meta property="fb:app_id" content="370495083058038" />
<meta property="og:type" content="website" />
<meta property="og:site_name" content="Pack" />
<meta property="og:locale" content="en_US" />
<meta property="og:url" content="http://packdog.com/" />
<meta property="og:image" content="http://packdog.com/static/facebook.jpg" />
<meta property="og:description" content="Pack is the new home to capture and share the everyday moments in your dog’s life." />
Meta Property=og标签是什么呢?
og是一种新的HTTP头部标记，即Open Graph Protocol：
The Open Graph Protocol enables any web page to become a rich object in a social graph.
即这种协议可以让网页成为一个“富媒体对象”。
用了Meta Property=og标签，就是你同意了网页内容可以被其他社会化网站引用等，目前这种协议被SNS网站如Fackbook、renren采用。
SNS已经成为网络上的一大热门应用，优质的内容通过分享在好友间迅速传播。为了提高站外内容的传播效率，2010年F8会议上Facebook公布了一套开放内容协议(Open Graph Protocol)，任何网页只要遵守该协议，SNS就能从页面上提取最有效的信息并呈现给用户。
Open Graph Protocol应用指南
参与到Open Graph Protocol的好处
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Meta Property标签的应用
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您可以重复meta标签，将认为og:type
<meta property=”og:type” content=”video”/>
<meta property=”og:title” content=”五月天_突然好想你MV现场版”/>
<meta property=”og:image” content=”http://g1.ykimg.com/0100641F464AC21FF0B3ED00
<meta property=”og:url” content=”http://v.youku.com/v_show/id_XMTIyMTY5NzMy.html”/>
<meta property=”og:videosrc” content=”http://player.youku.com/player.php/sid/XMTIyMTY5NzMy&isAutoPlay=true/v.swf”/>
<meta property=”og:width” content=”500″ />
<meta property=”og:height” content=”416″ />
<meta property=”og:type” content=”video”/>
<meta property=”og:title” content=”五月天_突然好想你MV现场版_AA”/>
<meta property=”og:image” content=”http://g1.ykimg.com/0100641F464AC21FF0B3ED00
<meta property=”og:url” content=”http://v.youku.com/v_show/id_XMTIyMTY5NzMyyyyyyyyyyyy
<meta property=”og:videosrc” content=”http://player.youku.com/player.php/sid/XXXXXXXXXXXXMTIyMTY5NzMy
<meta property=”og:width” content=”600″ />
<meta property=”og:height” content=”716″/>
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使用Open Graph Protocol应注意
meta property=og代码的功能并不等同于网页的meta name标签，两者针对的对象不一致，功能不同。
如果网站上要使用Open Graph Protocol，那么，meta property=og和meta name、Title标签应同时赋值。
文章开头举例的B2C网站，<head>如下：
<head>
<meta http-equiv=”Content-Type” content=”text/html;charset=utf-8″ />
<title>Cool Gadgets at the Right Price – Worldwide Free Shipping – ******</title>
<meta property=”og:title” content=”**’sFacebook” />
<meta property=”og:type” content=”product”/>
<meta property=”og:url” content=”http://www.******.com” />
<meta property=”og:image” content=”http://www.******.com/logo.gif”/>
<meta property=”og:site_name” content=”******.COM” />
<meta property=”og:description” content=”CoolGadgets at the RightPrice – Worldwide Free Shipping – ******”/>
<meta property=”fb:admins” content=”100001422224225″ />
<meta property=”fb:page_id” content=”241333394220″/>
<link href=”/css/reset.css” rel=”stylesheet”type=”text/css” />
<link href=”/css/default/all.16666.css” rel=”stylesheet” type=”text/css” />
<script type=”text/javascript” src=”/shop.js”></script>
<script type=”text/javascript” src=”/scripts/all.16666.build.js”></script>
<meta http-equiv=”Content-Type” content=”text/html;charset=utf-8″ />
<meta name=“description” content=”Online shopping for cool gadgets at the right price. ” />
<meta name=“keywords” content=”cool gadgets, cheap gadgets, free shipping” />
</head>
如果你用上了Meta Property标签，你得在后台设置好，不然，就是空白.
原作者：http://gaoke0820.blog.163.com/blog/static/21664965201385104151396/
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