Mirco Babini

LinkedIn Perfect Share detects when LinkedIn is parsing/crawling the Open Graph tags of a post/page and provides a simplified version of the contents. This allows the scraper to see the correct sharing post’s data for the provided URL; the information includes the post title, the description and the Featured Image (that is the standard content for the WordPress’ og:image field).
Full description here: http://www.mircobabini.com/project/linkedin-perfect-share-plugin-for-wordpress/ 
Developed by Mirco Babini, WordPress Consultant, Web Developer and Data Lover.
<h4>Usage</h4>
It just works. You simply need to install and activate it.

LinkedIn Perfect Share

Provides precise Open Graph data to LinkedIn for perfect sharing

jcvangent

inboundrocket

Selection Sharer makes it super easy for your readers to share your content and drive new visitors to your site. With Selection Sharer, any visitor on your website/blog can easily 
highlight any part of your content and share it immediately on Twitter, Facebook, LinkedIn or via email. Ultimately, the more your readers share, the more new traffic your site will get.
When a visitor highlights some text on your WordPress website they will be presented by a Medium like popover menu to share their highlighted content. This plugin supports both desktop (with a pop-over) as well as mobile devices (with a pop-under). This plugin is made possible by the excellent work done by <a href="https://github.com/xdamman/selection-sharer" rel="nofollow ugc">@xdamman</a> and is based on his code.

Selection Sharer by Hans van Gent

Works great!

Medium like popover menu to share on Twitter, Facebook, LinkedIn or by email any text selected on the page.

LinkedIn Perfect Share vs Selection Sharer by Hans van Gent