None of the answers to related issues have helped me.
I am trying to create a Facebook login for my Ning site. When I Add Platform under settings, it is only the 'Website' icon that is unclickable.
I followed the Ning instructions for enabling this to the letter, they are here: http://www.ning.com/ning3help/enable-social-sign-in-with-facebook/
Any help would be appreciated.
I had this problem too:
In my case it was because the Website section was already added: