Facebook first introduced open graph in 2010 and since that time it has been used to define digital objects all over the Internet. Websites, movies, and even locations can become “rich objects” in this social graph powered by Open Graph(OG) metadata.
But what exactly is Open Graph? And why would you want to use it on your website?
In this post I hope to shed some light by answering that question. You’ll learn about OG implementation and how metadata can be used to power social network sharing features. If you’re a webmaster or blogger who doesn’t understand how Open Graph works, this post has everything you need to know…
from Vandelay Design http://www.vandelaydesign.com/ultimate-guide-to-open-graph/