OpenGraph is an extension developed by Facebook how to enhance information usable during sharing in social networks. OpenGraph enhances meta information of your pages, in that way it differs from microdata rich snippets which identify structured data in your web content. Using OpenGraph elements you can tell to Facebook or G+ right sitename, title, description, image and content type instead of let the social network to do it own way.
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There is a plenty of photography tools published on the web. These tools can be widely used for planning trip, for understanding how your camera is working, for post-processing of your images and so on. In this article I will provide you links to calculators which can be helpful on topics mentioned above. All of them come from Cambridge In Colour web site.