I understand that this question is old, but it is still the best hit by Google, so I decided to give an updated answer, including popular social networking sites.
I usually have four groups of meta information:
Regular meta information - used by search engines and browsers
<title>{{pageTitle}}</title> <meta charset="utf-8"> <meta name="description" content="{{description}}"> <meta name="keywords" content="{{keywords}}"> <link rel="author" href="https://plus.google.com/{{googlePlusId}}" /> <link rel="canonical" href="{{pageUrl}}" />
Facebook meta info - used by Facebook when someone shares your URL
<meta property="og:url" content="{{pageUrl}}"> <meta property="og:image" content="{{imageUrl}}"> <meta property="og:description" content="{{description}}"> <meta property="og:title" content="{{pageTitle}}"> <meta property="og:site_name" content="{{siteTitle}}"> <meta property="og:see_also" content="{{homepageUrl}}">
Google+ metalic information - used by Google+ when someone shares your URL
<meta itemprop="name" content="{{pageTitle}}"> <meta itemprop="description" content="{{description}}"> <meta itemprop="image" content="{{imageUrl}}">
Note: you really donβt need it, Google+ will return to the Open Graph tags that Facebook uses.
Twitter Meta Info - Used by Twitter when someone shares your URL.
<meta name="twitter:card" content="summary"> <meta name="twitter:url" content="{{pageUrl}}"> <meta name="twitter:title" content="{{pageTitle}}"> <meta name="twitter:description" content="{{description}}"> <meta name="twitter:image" content="{{imageUrl}}">
Alden Sep 18 '13 at 12:29 2013-09-18 12:29
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