Alex Moss

This plugin lets you easily add the Linkedin Profile badge to your WordPress blog via a shortcode.
Simply install the plugin and insert the shortcode where you want. You can also hardcode the shortcode into your theme templates.
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<li>More <a href="http://3doordigital.com/wordpress/plugins/" rel="nofollow ugc">WordPress Plugins</a>.</li>
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Linkedin Profile Badge

This plugin lets you easily add the Linkedin Profile badge to your WordPress blog via a shortcode.

oneline

A Simple plugin which adds a widget to your wordpress admin widget area which you can then assign to the side bar etc… features are as follows:
Allows you to set your user / social ID’s 
Allows you to switch from icons or text links 
Allows you to turn social button / links on or off
Supported Social Sites:
Facebook 
Twitter 
Linkedin 
RSS

Easy Social Share

A Simple plugin which adds a widget to your wordpress admin widget area which you can then assign to the side bar etc...

Linkedin Profile Badge vs Easy Social Share