allow interactions to be viewed on public posts when not logged in

app/controllers/posts_controller.rb

@@ -7,7 +7,7 @@ require Rails.root.join("app", "presenters", "post_presenter")
 class PostsController < ApplicationController
   include PostsHelper
   
-  before_filter :authenticate_user!, :except => [:show, :iframe, :oembed]
+  before_filter :authenticate_user!, :except => [:show, :iframe, :oembed, :interactions]
   before_filter :set_format_if_malformed_from_status_net, :only => :show
   before_filter :find_post, :only => [:show, :next, :previous, :interactions]