Anyway, AFAIK I have accurately followed the instructions and have the IDs etc from linked in.
For the OAuth 2.0 Authorized Redirect URLs I have adapted the information on the component page on our website;
Please note: set in parameter redirect_uri the following link: http://www.yoursite.domain/index.php?option=com_jsn&tmplsocial=1&view=linkedin&task=accesstoken
But it seems whatever I do I get the linkedin dialog response -
invalid redirect_uri. This value must match a URL registered with the API Key.