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This article explain about How to Adding Facebook Facepile to Your Site. The Facepile widget shows the faces of friends who have Liked your page or have signed up to the site. If none of your friends have interacted with your content, it will show the total number of Likes without any accompanying faces.

Since the Like Button also shows faces of friends who have Liked the same page as you, this seems mostly useful for membership sites.

To add Facepile to your site, visit Facebook’s Facepile page.