fb_options[:client_options] = { :site => 'https://graph.facebook.com', :authorize_url => 'https://www.facebook.com/dialog/oauth', :token_url => '/oauth/access_token' } provider :facebook, api_key, secret_key, fb_options
> (according to) Andrew Fowler (from the comment thread on facebook)
The solution is to replace your OAuth Dialog URL: "https://graph.facebook.com/oauth/authorize?...... with the up-to-date URL: "https://www.facebook.com/dialog/oauth?....... They removed support for some parameters without fixing the redirect from their old endpoint.
