The Facepile plugin displays the Facebook profile pictures of users who have connected with your page via a global or custom action, or can also be configured to display users that have signed up for your site. If you want to display users who have connected to your page via an action, specify with the action parameter <fb:facepile href="http://zhen.myfbse.com/rb-roastchicken.html" action="og_recipebox:planning_to_make" width="300" max_rows="1"></fb:facepile>