FACEBOOK OPEN GRAPH

It's used on Facebook to allow any web page and contents to have the same functionality as any other object on Facebook.

og:title

This is where you put the title of your content. Think of this as being similar to your normal html title tag that a search engine would use. When creating your og:title, keep the character count to fewer than 95 characters.

Example: <meta property=”og:title” content=”SEO Tech Support”/>

og:type

This is where you describe what type of content you are sharing. Is it a video, picture, blog post, etc.
Example:-
Business => bar, company, café
Organizations => band, government, non_profit
Websites => blog, website,  article

Example: <meta property=”og:type” content=”Website”/>

og:description

This is also similar to your html meta description tag because it is used to describe your content. You have up to 297 characters for this tag.

Example: <meta property=”og:description” content=”We are focusing on the latest Google guideline and innovative SEO techniques to get top ranking and maximum ROI for each of our website. “/>

og:image

An image has to be at least 50px by 50px, but they prefer images that are bigger than 200px by 200px. Plus, the image can’t be more than 5 MB in size.

Example: <meta property=”og:image” content=”http://www.absoluteranking.com/public/HomePageSliderImage/1398234433_1.jpg”/>

og:url

This tag may seem irrelevant, but it’s important because sometimes you’ll have more than one URL for the same content. By using this tag, you’ll ensure that all shares go to one URL versus multiple URLs
Example: <meta property=”og:url” content=”http://www.absoluteranking.com/”/>

og: site_name

This tag tells Facebook the name of your website. You don’t really need this tag, but there is no harm in including it.

Example: <meta property=”og:site_name” content=”Absolute Ranking”/>

fb:dmins

If you have a fan page on Facebook and you want to get more data in Facebook Insights, then you have to use this tag. It tells Facebook you are the site owner, and it connects your Facebook fan page to your website.

Example: <meta property=”fb:admins” content=”411253648932541″/>