I want to offer a quick look inside the technology behind Facebook’s Open Graph initiative to show how easy it is to mark up your website and let Facebook users interact with it. This is only a ...

And most of them offer handy “share this on…” buttons that you can add to your site – all with the tantalising promise of sending you more traffic.

Tumblr now has a button too, following the trend taken up by a growing number of social-media minded companies. The Tumblr Button works much like its designed-to-share contemporaries.