This Plugin provides an option for users to login with Linkedin account. As soon as you enable linkedin login option from Control Panel (Control Panel → Instance Settings → Authentication → LinkedIn), it will show Linkedin button on Liferay login page. Upon clicking on that button user will be directed to Linkedin page and asked to signin ( also ask for approval to access basic profile details) and then redirect back to after login landing page of Liferay.

Also it will fetch Linkedin profile data and create a Liferay user using Linkedin's primary email address.