This plugin integrates the Drag to Share functionality into your Joomla! site, this way your visitors can drag an image to share the page they are on. Everything is explained here in detail by Dan Wellman on nettuts This function became popular through mashable and is now available for your Joomla! site.
It works just like on mashable, so head there to any article to see about how it works.
Instructions how to disable DragonShare manually can be found in our forums.