This plugin lets you place a LinkedIn Share button on your WordPress blog as a widget and/or using shortcode.
To use the widget just drag it to a sidebar and choose one of three button styles. You can also specify a url to share. If you leave the url empty, the active page will be shared.
Using shortcode: The simplest version is [share/] which will add a button without counter using the permalink of the page or post.
To further customize the button you can use the following attributes: * mode: none (default), top or right to set the counter style * url: Any url you would like visitors to share instead of the current page or post permalink
Some examples of correct usage of this shortcode are: [share/] [share mode="right"/] [share mode="top" url="http://www.wordpress.org"/]