Perhaps timely for the announcement of LinkedIn University Pages yesterday, the LinkedIn Auth and Block for Moodle has been released for Moodle 2.5 by Bas Brands. The tool provides a way for potential Moodlers to register/login to your site with their LinkedIn account credentials (similar to Facebook Connect). The tool uses OAuth [http://moodle.org/plugins/view.php?plugin=auth_googleoauth2] and is incredibly easy to use as an end user.
Download both the Auth and Block addons at https://moodle.org/plugins/browse.php?list=set&id=12
I gave it a try at http://theming.sonsbeekmedia.nl/ which is setup as a demo site.
The block is clearly marked with options to login,
The next screen gives you the ability to login to LinkedIn,
And once authenticated it clearly shows your login profile on the home page: