ShowAddThis

This plugin displays an AddThis button in an article. You can choose from six different images or use a custom one. The button can be displayed before the content, after the content and even at a custom place by using the “{addthis}” command. Furthermore you can select whether the button is shown in articleview, categoryview or sectionview. Every combination of view and position is possible
Of course you can exclude articles, categories or sections from displaying the button.