Take a look at content_socialmedia_facebook's templates for example client.
facebook_like_box.tpl is likely outdated. https://developers.facebook.com/docs/plugins/like-box-for-pages is the latest spec. Check if using an iframe is required. Locale is probably no longer supported. Instead a color scheme option is now available.
facebook_like_button.tpl is likely outdated. https://developers.facebook.com/docs/plugins/like-button is the latest spec. Check if using an iframe is required.