You can display a new share button in the article page and in the module My Posts.

Just after the Google+ button in July, it's now time for the LinkedIn share button to be listed in the social network buttons list. By clicking on this buttion, your readers will republish your article in their LinkedIn stream.

The pop-up used by LinkedIn to validate the publication is quite interesting.
Users can edit the title and the description of the backlink they are going to create.
A comment can also be added.
Note that there's a feature which is pretty much like the Circles features in G+. You can choose with whom you want to share the link : everybody, your connections or somebody in particular.

For some professional website, sharing on LinkedIn drives much more trafic than sharing on Facebook or Twitter. We have received some great feedback from WMaker users regarding this.

I am curious to discover the impact on your trafic after adding the LinkedIn share button on your website. Feel free to tell us in the comments.