Facebook Facepile plugin displays the Facebook profile images of users who have liked your page or have signed up for your blog. If you want this plugin to display users who have liked your page, be sure to specify the URL of your page. If you want this plugin to display users who have signed up for your blog, then you will need an application id.
This plugin only displays pictures of your friends who have logged in. If none of your friends have liked your page or signed up for your blog, then this plugin will render nothing. You can specify the maximum number of rows to display the profile pictures. This plugin dynamically adjust its size.
The Facebook Facepile social plugin is very simple. Basically, this is like the login with face without the login button, and it will shows the profile photos of Facebook friends visitor which have "connected" to your blog.