Why Open Graph
To cut his long story short, if you install them, then when someone shares your blog-post, the shared item looks better. This means that more people are likely to follow the link and/or share it themselves - so your blog gets more traffic, and people think you're more professional and thus credible.
Neil also stated that if you don't use Wordpress, "you’ll need to manually generate meta tags for each page on your site" - but fortunately for Blogger users who are brave enough to edit their template that's not true. Blogger provides lots of SEO-supportive features these days, and you can easily use them to make OG-tags work on your blog - even if you haven't quite got your head around what OG is - personally it too me months to understand what it was all about.
The following sections have more details about how to do this.
How to install Facebook's Open Graph tags into a blog made with Blogger
Edit your template in the usual way.
1 Tell Google about the namespace:
Find the opening <html ... statement, and add the Open Graph namespace information to it. The code to add isxmlns:og='http://ogp.me/ns#'and it goes after the existing namespace statements. For example, my current tag looks like:
<html b:version='2' class='v2' expr:dir='data:blog.languageDirection'
xmlns='http://www.w3.org/1999/xhtml'
xmlns:b='http://www.google.com/2005/gml/b'
xmlns:data='http://www.google.com/2005/gml/data'
xmlns:expr='http://www.google.com/2005/gml/expr' >
or like this after the line is added:
<html b:version='2' class='v2' expr:dir='data:blog.languageDirection'
xmlns='http://www.w3.org/1999/xhtml'
xmlns:b='http://www.google.com/2005/gml/b'
xmlns:data='http://www.google.com/2005/gml/data'
xmlns:expr='http://www.google.com/2005/gml/expr'
xmlns:og='http://ogp.me/ns#'>
2 Add the Open Graph tags
Find the closing </head> tag.
(Hint: I often search for just </head ie without the closing >, in case there's something else in the tag in my template)
Put the following code immediately before it:
<!-- Begin Open Graph metadata -->
<meta expr:content='"en_US"' property='og:locale'/> <meta expr:content='data:blog.canonicalUrl' property='og:url'/>
<b:if cond='data:blog.pageType == "item"'>
<meta expr:content='data:blog.pageName' property='og:title'/>
<meta content='article' property='og:type'/>
</b:if>
<meta expr:content='data:blog.title' property='og:site_name'/>
<b:if cond='data:blog.postImageThumbnailUrl'>
<meta expr:content='data:blog.postImageThumbnailUrl' property='og:image'/>
<b:else/>
<meta content='URL-FOR-IMAGE-YOU-WANT-TO-USE-IF-THERE-IS-NOT-A-THUMBNAIL-PHOTO-IN-THE-POST' property='og:image'/>
</b:if>
<b:if cond='data:blog.metaDescription'>
<meta expr:content='data:blog.metaDescription' property='og:description'/>
<b:else/>
<meta expr:content='data:post.snippet' property='og:description'/>
</b:if>
<!-- End Open Graph metadata -->
This code needs to be adapted for your blog. In particular:
- en_US
And if you are using a different language altogether, you should change it to the two letter code for that language-territory combination: see https://developers.facebook.com/docs/internationalization/ for more information about the codes that they support
- URL-FOR-IMAGE-YOU-WANT-TO-USE-IF-THERE-IS-NOT-A-THUMBNAIL-PHOTO-IN-THE-POST
- App-ID and Facebook-Profile-ID
If you have got an App-ID associated with your blog, perhaps because you signed up to use Facebook commenting with it, then you may also want to add the following statements, just before the "<!-- End Open Graph metadata -->"
<meta content='App-ID' property='fb:app_id'/>
<meta content='Facebook-Profile-ID' property='fb:admins'/>
Of course putting in your own values instead of the ones in red (I'm assuming that if you knew enough to get an App-ID, then you will know how to find it, and also about the risks associated with linking your Facebook-profile-ID to your blog.)
3 Check it's complete:
Preview the template changes to make sure that they've worked, and then save them.Troubleshooting
Testing the OG tags
Facebook have a tool that you can use to see what values the OG tags in your blog have.It is found here: https://developers.facebook.com/tools/debug
Enter the URL of one of the posts from your blog and click Debug to see the OG tags which Facebook finds for it.
Descriptions
The Descriptions tag will only work if you have Search-descriptions on (Option > Search > Meta-tags > Enabled), and have entered a search description for each post using the post-editor. I had hoped to be able to use post.snippet when this wasn't available, but have not been able to work out the correct syntax to do this.Pictures
Facebook would like you to use an image that's at least 200x200 as your posts's thumbnail image or as the default image to use for posts that don't have one.If the picture that you use is smaller than this, they do appear to use it.
However you will see the following message when you use a debugging tool to look at what tags Facebook is reading from your site:
og:image should be larger
Provided og:image is not big enough. Please use an image that's at least 200x200 px. Image 'http://3.bp.blogspot.com/XXX.png' will be used instead.
Related Articles:
Advantages and disadvantages of editing your Blogger template
Post.thumbnail: a summary image for a post
How to edit your Blogger template
Linking your blog to the social networks
